Adding OverrideStringResource API to ResourceBundle.

ui/base/resource/resource_bundle.cc

Index: ui/base/resource/resource_bundle.cc
diff --git a/ui/base/resource/resource_bundle.cc b/ui/base/resource/resource_bundle.cc
index 2890c41b6e2e44c9e43bef6cddf6d63afe507a8a..ffc8d907a6d0f09746fc0b1d1c09f40b40b0d889 100644
--- a/ui/base/resource/resource_bundle.cc
+++ b/ui/base/resource/resource_bundle.cc
@@ -311,6 +311,11 @@ void ResourceBundle::OverrideLocalePakForTest(const base::FilePath& pak_path) {
   overridden_pak_path_ = pak_path;
 }
 
+void ResourceBundle::OverrideStringResource(
+    int message_id, const base::string16& overridding_string) {
+  overridden_strings_[message_id] = overridding_string;
+}
+
 const base::FilePath& ResourceBundle::GetOverriddenPakPath() {
   return overridden_pak_path_;
 }
@@ -439,6 +444,9 @@ base::string16 ResourceBundle::GetLocalizedString(int message_id) {
   if (delegate_ && delegate_->GetLocalizedString(message_id, &string))
     return string;
 
+  if (overridden_strings_.find(message_id) != overridden_strings_.end())

[grt (UTC plus 2), 2014/06/09 16:54:44]

avoid doing two O(logN) scans when there's a hit with:
  IdToStringMap::const_iterator it = overridden_strings_.find(message_id);
  if (it != overridden_strings_.end())
    return it->second;

or something like that

[jwd, 2014/06/10 20:59:25]

Done.

+    return overridden_strings_[message_id];
+
   // Ensure that ReloadLocaleResources() doesn't drop the resources while
   // we're using them.
   base::AutoLock lock_scope(*locale_resources_data_lock_);