Fixed CheckSettingsChanges presubmit function (#34666)

* Fixed `CheckSettingsChanges` presubmit function

There were two problems:
1. Somehow the `registry_full_path` misses segments `chrome` and
   `android` when accessing `SearchIndexProviderRegistry.java`, so
   it is
   `.../brave-browser/src/java/src/org/chromium/chrome/browser/settings/search/SearchIndexProviderRegistry.java`
   instead of an actual
   `.../brave-browser/src/chrome/android/java/src/org/chromium/chrome/browser/settings/search/SearchIndexProviderRegistry.java`
   which causes the registry not being read
2. `input_api.ReadFile` could not read outside of repo root which
   is `brave-browser/src/brave` so it could not read `SearchIndexProviderRegistry.java`

Fixed both with patching or chromium_presubmit_overrides.py

Resolves https://github.com/brave/brave-browser/issues/53560

patches/PRESUBMIT.py.patch

@@ -0,0 +1,12 @@
+diff --git a/PRESUBMIT.py b/PRESUBMIT.py
+index 00f85840ae075b43d7503f386a221f7037f40503..1f077c67a3d9e54ecbd3f766e9c18a0bf16c7f20 100644
+--- a/PRESUBMIT.py
++++ b/PRESUBMIT.py
+@@ -8207,6 +8207,7 @@ def CheckSettingsChanges(input_api, output_api):
+     relevant_files_found = False
+     registry_content = ''
+     registry_full_path = input_api.os_path.join(input_api.PresubmitLocalPath(),
++                                                "chrome", "android",
+                                                 registry_path)
+ 
+     try:

script/chromium_presubmit_overrides.py

@@ -100,6 +100,7 @@ def modify_input_api(input_api):
         *config['additional_default_files_to_check'], )
     override_canned_checks(input_api.canned_checks)
     setup_per_check_file_filter(input_api)
+    setup_read_file_override(input_api)
 
 
 # Disables checks or forces presubmit errors for checks listed in the config.
@@ -185,6 +186,46 @@ def setup_per_check_file_filter(input_api):
             return self._cached_changed_contents[:]
 
 
+def setup_read_file_override(input_api):
+
+    @override_utils.override_method(input_api)
+    def ReadFile(_self, original_method, file_item, mode='r'):
+
+        def is_affected_file_inside_chromium_repo(_self, file_item):
+            if isinstance(file_item, input_api.change._AFFECTED_FILES):
+                file_item = file_item.AbsoluteLocalPath()
+
+            from pathlib import Path
+            repo_root = Path(_self.change.RepositoryRoot())
+
+            if (repo_root.name == "brave" and repo_root.parent.name == "src"
+                    and file_item.startswith(str(repo_root.parent))):
+                return True
+
+            return False
+
+        try:
+            return original_method(file_item, mode)
+        except IOError as io_error:
+            # We want to pass over the exception of reading
+            # reading anything outside the repository from InputApi.ReadFile.
+            # So just re-throw as is any other exception
+            if (str(io_error)
+                    != 'Access outside the repository root is denied.'):
+                raise
+
+            # We are here because of the original input_api.ReadFile
+            # behaviour. When the RepositoryRoot() is brave-browser/src/brave -
+            # it doesn't allow us to access brave-browser/src .
+            # But in fact we are ok to read from brave-browser/src
+            if is_affected_file_inside_chromium_repo(_self, file_item):
+                import gclient_utils
+                return gclient_utils.FileRead(file_item, 'r')
+
+            # Give up, we are even outside brave-browser/src
+            raise
+
+
 # Inlines presubmit file as if it was run from the dir where it's located.
 def inline_presubmit(filename, _globals, _locals):
     class State: