Introduce bottom controls to CC and let it respond to scrolling

ui/android/delegated_frame_host_android.h

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef UI_ANDROID_DELEGATED_FRAME_HOST_ANDROID_H_
 #define UI_ANDROID_DELEGATED_FRAME_HOST_ANDROID_H_
 
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
 #include "cc/output/copy_output_request.h"
@@ skipping 69 matching lines @@
   ReturnResourcesCallback return_resources_callback_;
 
   std::unique_ptr<cc::SurfaceFactory> surface_factory_;
 
   struct FrameData {
     FrameData();
     ~FrameData();
 
     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_;
 
   scoped_refptr<cc::SurfaceLayer> content_layer_;
 
   scoped_refptr<cc::Layer> background_layer_;
 
   gfx::Size container_size_in_dip_;
 
   DISALLOW_COPY_AND_ASSIGN(DelegatedFrameHostAndroid);
 };
 
 }  // namespace ui
 
 #endif  // UI_ANDROID_DELEGATED_FRAME_HOST_ANDROID_H_