Introduce bottom controls to CC and let it respond to scrolling

cc/input/top_controls_manager.h

 // Copyright 2013 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 CC_INPUT_TOP_CONTROLS_MANAGER_H_
 #define CC_INPUT_TOP_CONTROLS_MANAGER_H_
 
 #include <memory>
 
 #include "base/macros.h"
@@ skipping 22 matching lines @@
   static std::unique_ptr<TopControlsManager> Create(
       TopControlsManagerClient* client,
       float top_controls_show_threshold,
       float top_controls_hide_threshold);
   virtual ~TopControlsManager();
 
   float ControlsTopOffset() const;
   float ContentTopOffset() const;
   float TopControlsShownRatio() const;
   float TopControlsHeight() const;
+  float BottomControlsHeight() const;
+  float BottomControlsOffset() const;

[bokan, 2016/06/30 12:31:21]

Please match the exiting convention:

BottomControlsOffset -> ControlsBottomOffset
BottomContentOffset -> ContentBottomOffset

[Ian Wen, 2016/07/01 02:51:44]

Done.

+  float BottomContentOffset() const;
 
   bool has_animation() const { return animation_direction_ != NO_ANIMATION; }
   AnimationDirection animation_direction() { return animation_direction_; }
 
   void UpdateTopControlsState(TopControlsState constraints,
                               TopControlsState current,
                               bool animate);
 
   void ScrollBegin();
   gfx::Vector2dF ScrollBy(const gfx::Vector2dF& pending_delta);
@@ skipping 46 matching lines @@
   float top_controls_hide_threshold_;
 
   bool pinch_gesture_active_;
 
   DISALLOW_COPY_AND_ASSIGN(TopControlsManager);
 };
 
 }  // namespace cc
 
 #endif  // CC_INPUT_TOP_CONTROLS_MANAGER_H_