Add new ResourceBundle::Delegate interface.

ui/base/resource/resource_bundle_android.cc

Index: ui/base/resource/resource_bundle_android.cc
===================================================================
--- ui/base/resource/resource_bundle_android.cc	(revision 134688)
+++ ui/base/resource/resource_bundle_android.cc	(working copy)
@@ -17,9 +17,11 @@
 
 FilePath GetResourcesPakFilePath(const std::string& pak_name) {
   FilePath path;
-  PathService::Get(base::DIR_ANDROID_APP_DATA, &path);
-  DCHECK(!path.empty());
-  return path.AppendASCII("paks").AppendASCII(pak_name.c_str());
+  if (PathService::Get(base::DIR_ANDROID_APP_DATA, &path))
+    return path.AppendASCII("paks").AppendASCII(pak_name.c_str());
+
+  // Return just the name of the pack file.
+  return FilePath(pak_name.c_str());
 }
 
 }  // namespace
@@ -35,7 +37,8 @@
               ResourceHandle::kScaleFactor100x);
 }
 
-gfx::Image& ResourceBundle::GetNativeImageNamed(int resource_id, ImageRTL rtl) {
+const gfx::Image& ResourceBundle::GetNativeImageNamed(int resource_id,
+                                                      ImageRTL rtl) {
   // Flipped image is not used on Android.
   DCHECK_EQ(rtl, RTL_DISABLED);
   return GetImageNamed(resource_id);