Add mojom interface to android for day zero experience

android/brave_java_sources.gni

@@ -206,6 +206,7 @@ brave_java_sources = [
   "../../brave/android/java/org/chromium/chrome/browser/custom_layout/popup_window_tooltip/PopupWindowTooltip.java",
   "../../brave/android/java/org/chromium/chrome/browser/custom_layout/popup_window_tooltip/PopupWindowTooltipUtils.java",
   "../../brave/android/java/org/chromium/chrome/browser/customtabs/features/partialcustomtab/BravePartialCustomTabBottomSheetStrategy.java",
+  "../../brave/android/java/org/chromium/chrome/browser/day_zero/DayZeroMojomHelper.java",
   "../../brave/android/java/org/chromium/chrome/browser/decentralized_dns/settings/ENSSettingsFragment.java",
   "../../brave/android/java/org/chromium/chrome/browser/decentralized_dns/settings/RadioButtonGroupDDnsResolveMethodPreference.java",
   "../../brave/android/java/org/chromium/chrome/browser/decentralized_dns/settings/RadioButtonGroupEnsOffchainResolveMethodPreference.java",

android/java/org/chromium/chrome/browser/day_zero/DayZeroMojomHelper.java

@@ -0,0 +1,80 @@
+/* Copyright (c) 2024 The Brave Authors. All rights reserved.
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at https://mozilla.org/MPL/2.0/. */
+
+package org.chromium.chrome.browser.day_zero;
+
+import org.jni_zero.JNINamespace;
+import org.jni_zero.NativeMethods;
+
+import org.chromium.content_public.browser.BrowserContextHandle;
+import org.chromium.day_zero.mojom.DayZeroBrowserUiExpt;
+import org.chromium.mojo.bindings.ConnectionErrorHandler;
+import org.chromium.mojo.bindings.Interface;
+import org.chromium.mojo.bindings.Interface.Proxy.Handler;
+import org.chromium.mojo.system.MessagePipeHandle;
+import org.chromium.mojo.system.MojoException;
+import org.chromium.mojo.system.impl.CoreImpl;
+
+/** Helper to interact with native DayZeroBrowserUiExpt. */
+@JNINamespace("day_zero")
+public class DayZeroMojomHelper implements ConnectionErrorHandler {
+    private long mNativeDayZeroBrowserUiExpt;
+    DayZeroBrowserUiExpt mDayZeroBroserUiExptHelper;
+
+    private static final Object sLock = new Object();
+    private static DayZeroMojomHelper sInstance;
+
+    public static DayZeroMojomHelper getInstance(BrowserContextHandle browserContextHandle) {
+        synchronized (sLock) {
+            if (sInstance == null) {
+                sInstance = new DayZeroMojomHelper(browserContextHandle);
+            }
+        }
+        return sInstance;
+    }
+
+    private DayZeroMojomHelper(BrowserContextHandle browserContextHandle) {
+        mNativeDayZeroBrowserUiExpt = DayZeroMojomHelperJni.get().init(browserContextHandle);
+        long nativeHandle =
+                DayZeroMojomHelperJni.get()
+                        .getInterfaceToAndroidHelper(mNativeDayZeroBrowserUiExpt);
+        MessagePipeHandle handle =
+                CoreImpl.getInstance().acquireNativeHandle(nativeHandle).toMessagePipeHandle();
+        mDayZeroBroserUiExptHelper = DayZeroBrowserUiExpt.MANAGER.attachProxy(handle, 0);
+        Handler handler = ((Interface.Proxy) mDayZeroBroserUiExptHelper).getProxyHandler();
+        handler.setErrorHandler(this);
+    }
+
+    private void destroy() {
+        synchronized (sLock) {
+            sInstance = null;
+            if (mNativeDayZeroBrowserUiExpt == 0 && mDayZeroBroserUiExptHelper == null) {
+                return;
+            }
+            mDayZeroBroserUiExptHelper.close();
+            mDayZeroBroserUiExptHelper = null;
+            DayZeroMojomHelperJni.get().destroy(mNativeDayZeroBrowserUiExpt);
+            mNativeDayZeroBrowserUiExpt = 0;
+        }
+    }
+
+    public void isDayZeroExpt(DayZeroBrowserUiExpt.IsDayZeroExpt_Response callback) {
+        mDayZeroBroserUiExptHelper.isDayZeroExpt(callback);
+    }
+
+    @Override
+    public void onConnectionError(MojoException e) {
+        destroy();
+    }
+
+    @NativeMethods
+    public interface Natives {
+        long init(BrowserContextHandle browserContextHandle);
+
+        void destroy(long nativeDayZeroBrowserUiExpt);
+
+        long getInterfaceToAndroidHelper(long nativeDayZeroBrowserUiExpt);
+    }
+}

browser/day_zero_browser_ui_expt/android/day_zero_browser_ui_expt.cc

@@ -0,0 +1,64 @@
+/* Copyright (c) 2024 The Brave Authors. All rights reserved.
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at https://mozilla.org/MPL/2.0/. */
+
+#include "brave/browser/day_zero_browser_ui_expt/android/day_zero_browser_ui_expt.h"
+
+#include <utility>
+#include <vector>
+
+#include "base/strings/strcat.h"
+#include "brave/build/android/jni_headers/DayZeroMojomHelper_jni.h"
+#include "chrome/browser/browser_process.h"
+#include "chrome/browser/profiles/profile.h"
+#include "content/public/browser/android/browser_context_handle.h"
+#include "content/public/browser/browser_context.h"
+#include "mojo/public/cpp/bindings/pending_remote.h"
+
+namespace day_zero {
+
+DayZeroBrowserUiExpt::DayZeroBrowserUiExpt(content::BrowserContext* context) {
+  // auto skus_service_getter = base::BindRepeating(
+  //     [](content::BrowserContext* context) {
+  //       return skus::SkusServiceFactory::GetForContext(context);
+  //     },
+  //     context);
+  // pref_service_ = Profile::FromBrowserContext(context)->GetPrefs();
+  // credential_manager_ = std::make_unique<ai_chat::AIChatCredentialManager>(
+  //     skus_service_getter, g_browser_process->local_state());
+}
+
+DayZeroBrowserUiExpt::~DayZeroBrowserUiExpt() = default;
+
+void DayZeroBrowserUiExpt::BindInterface(
+    mojo::PendingReceiver<mojom::DayZeroBrowserUiExpt> pending_receiver) {
+  receivers_.Add(this, std::move(pending_receiver));
+}
+
+static jlong JNI_DayZeroMojomHelper_Init(
+    JNIEnv* env,
+    const base::android::JavaParamRef<jobject>& jbrowser_context_handle) {
+  content::BrowserContext* browser_context =
+      content::BrowserContextFromJavaHandle(jbrowser_context_handle);
+  DayZeroBrowserUiExpt* settings_helper =
+      new DayZeroBrowserUiExpt(browser_context);
+  return reinterpret_cast<intptr_t>(settings_helper);
+}
+
+void DayZeroBrowserUiExpt::Destroy(JNIEnv* env) {
+  delete this;
+}
+
+jlong DayZeroBrowserUiExpt::GetInterfaceToAndroidHelper(JNIEnv* env) {
+  mojo::PendingRemote<mojom::DayZeroBrowserUiExpt> remote;
+  receivers_.Add(this, remote.InitWithNewPipeAndPassReceiver());
+
+  return static_cast<jlong>(remote.PassPipe().release().value());
+}
+
+void DayZeroBrowserUiExpt::IsDayZeroExpt(IsDayZeroExptCallback callback) {
+  std::move(callback).Run(true);
+}
+
+}  // namespace day_zero

browser/day_zero_browser_ui_expt/android/day_zero_browser_ui_expt.h

@@ -0,0 +1,45 @@
+/* Copyright (c) 2024 The Brave Authors. All rights reserved.
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at https://mozilla.org/MPL/2.0/. */
+
+#ifndef BRAVE_BROWSER_DAY_ZERO_BROWSER_UI_EXPT_DAY_ZERO_BROWSER_UI_EXPT_H_
+#define BRAVE_BROWSER_DAY_ZERO_BROWSER_UI_EXPT_DAY_ZERO_BROWSER_UI_EXPT_H_
+
+#include <memory>
+#include <string>
+
+#include "base/android/jni_android.h"
+#include "base/android/scoped_java_ref.h"
+#include "base/memory/raw_ptr.h"
+#include "brave/components/day_zero_browser_ui_expt/common/mojom/day_zero.mojom.h"
+#include "mojo/public/cpp/bindings/receiver_set.h"
+
+namespace content {
+class BrowserContext;
+}  // namespace content
+
+namespace day_zero {
+
+class DayZeroBrowserUiExpt : public mojom::DayZeroBrowserUiExpt {
+ public:
+  explicit DayZeroBrowserUiExpt(content::BrowserContext* context);
+  ~DayZeroBrowserUiExpt() override;
+
+  // mojom::DayZeroBrowserUiExpt:
+  void IsDayZeroExpt(IsDayZeroExptCallback callback) override;
+
+  void BindInterface(
+      mojo::PendingReceiver<mojom::DayZeroBrowserUiExpt> pending_receiver);
+
+  void Destroy(JNIEnv* env);
+  jlong GetInterfaceToAndroidHelper(JNIEnv* env);
+
+ private:
+  mojo::ReceiverSet<mojom::DayZeroBrowserUiExpt> receivers_;
+  base::WeakPtrFactory<DayZeroBrowserUiExpt> weak_ptr_factory_{this};
+};
+
+}  // namespace day_zero
+
+#endif  // BRAVE_BROWSER_DAY_ZERO_BROWSER_UI_EXPT_DAY_ZERO_BROWSER_UI_EXPT_H_

browser/day_zero_browser_ui_expt/android/sources.gni

@@ -0,0 +1,12 @@
+# Copyright (c) 2024 The Brave Authors. All rights reserved.
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this file,
+# You can obtain one at https://mozilla.org/MPL/2.0/.
+
+brave_browser_day_zero_browser_ui_expt_sources = [
+  "//brave/browser/day_zero_browser_ui_expt/android/day_zero_browser_ui_expt.cc",
+  "//brave/browser/day_zero_browser_ui_expt/android/day_zero_browser_ui_expt.h",
+]
+
+brave_browser_day_zero_browser_ui_expt_deps =
+    [ "//brave/components/day_zero_browser_ui_expt/common/mojom" ]

browser/sources.gni

@@ -17,6 +17,7 @@ import("//brave/browser/brave_vpn/sources.gni")
 import("//brave/browser/brave_wallet/android/sources.gni")
 import("//brave/browser/brave_wallet/notifications/sources.gni")
 import("//brave/browser/browsing_data/sources.gni")
+import("//brave/browser/day_zero_browser_ui_expt/android/sources.gni")
 import("//brave/browser/debounce/sources.gni")
 import("//brave/browser/download/sources.gni")
 import("//brave/browser/ephemeral_storage/sources.gni")
@@ -349,7 +350,9 @@ if (is_android) {
 
   brave_chrome_browser_sources += brave_browser_brave_wallet_android_sources
   brave_chrome_browser_sources += brave_browser_misc_metrics_android_sources
+  brave_chrome_browser_sources += brave_browser_day_zero_browser_ui_expt_sources
   brave_chrome_browser_deps += brave_browser_brave_wallet_android_deps
+  brave_chrome_browser_deps += brave_browser_day_zero_browser_ui_expt_deps
 
   brave_chrome_browser_deps += [
     "//brave/browser/android:android_browser_process",

build/android/BUILD.gn

@@ -225,6 +225,7 @@ generate_jni("jni_headers") {
     "//brave/android/java/org/chromium/chrome/browser/crypto_wallet/permission/BraveDappPermissionPromptDialog.java",
     "//brave/android/java/org/chromium/chrome/browser/crypto_wallet/util/WalletDataFilesInstallerUtil.java",
     "//brave/android/java/org/chromium/chrome/browser/crypto_wallet/util/WalletNativeUtils.java",
+    "//brave/android/java/org/chromium/chrome/browser/day_zero/DayZeroMojomHelper.java",
     "//brave/android/java/org/chromium/chrome/browser/informers/BraveSyncAccountDeletedInformer.java",
     "//brave/android/java/org/chromium/chrome/browser/misc_metrics/MiscAndroidMetricsFactory.java",
     "//brave/android/java/org/chromium/chrome/browser/notifications/BraveNotificationPlatformBridge.java",

build/android/config.gni

@@ -36,6 +36,7 @@ brave_chrome_java_deps = [
   "//brave/components/brave_shields/core/common:mojom_java",
   "//brave/components/brave_wallet/common:mojom_java",
   "//brave/components/browser_ui/site_settings/android:java",
+  "//brave/components/day_zero_browser_ui_expt/common/mojom:mojom_java",
   "//brave/components/misc_metrics/common:mojom_java",
   "//brave/components/playlist/common/mojom:mojom_java",
   "//brave/components/safe_browsing/android:brave_safe_browsing_java",
@@ -111,6 +112,7 @@ brave_jni_headers_sources = [
   "//brave/android/java/org/chromium/chrome/browser/crypto_wallet/fragments/dapps/ConnectAccountFragment.java",
   "//brave/android/java/org/chromium/chrome/browser/crypto_wallet/permission/BraveDappPermissionPromptDialog.java",
   "//brave/android/java/org/chromium/chrome/browser/crypto_wallet/util/WalletNativeUtils.java",
+  "//brave/android/java/org/chromium/chrome/browser/day_zero/DayZeroMojomHelper.java",
   "//brave/android/java/org/chromium/chrome/browser/informers/BraveSyncAccountDeletedInformer.java",
   "//brave/android/java/org/chromium/chrome/browser/misc_metrics/MiscAndroidMetricsFactory.java",
   "//brave/android/java/org/chromium/chrome/browser/notifications/BraveNotificationPlatformBridge.java",