Introduce bottom controls to CC and let it respond to scrolling

ui/android/delegated_frame_host_android.h

Index: ui/android/delegated_frame_host_android.h
diff --git a/ui/android/delegated_frame_host_android.h b/ui/android/delegated_frame_host_android.h
index d5a95c5022183d803664575d4fb4cfb787e02744..f56cb54f0c37a26e70d1238506a73aeb903de73d 100644
--- a/ui/android/delegated_frame_host_android.h
+++ b/ui/android/delegated_frame_host_android.h
@@ -87,7 +87,10 @@ class UI_ANDROID_EXPORT DelegatedFrameHostAndroid
 
     cc::SurfaceId surface_id;
     gfx::Size surface_size;
-    gfx::Vector2dF location_bar_content_translation;
+    float top_controls_height;
+    float top_controls_shown_ratio;
+    float bottom_controls_height;
+    float bottom_controls_shown_ratio;
     cc::Selection<gfx::SelectionBound> viewport_selection;
   };
   std::unique_ptr<FrameData> current_frame_;