Introduce bottom controls to CC and let it respond to scrolling

content/common/resize_params.h

 // Copyright 2015 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 CONTENT_COMMON_RESIZE_PARAMS_H_
 #define CONTENT_COMMON_RESIZE_PARAMS_H_
 
 #include "content/common/content_export.h"
 #include "third_party/WebKit/public/platform/WebDisplayMode.h"
 #include "third_party/WebKit/public/platform/WebScreenInfo.h"
@@ skipping 16 matching lines @@
   gfx::Size physical_backing_size;
 
   // Whether or not Blink's viewport size should be shrunk by the height of the
   // URL-bar (always false on platforms where URL-bar hiding isn't supported).
   bool top_controls_shrink_blink_size;
 
   // The height of the top controls (always 0 on platforms where URL-bar hiding
   // isn't supported).
   float top_controls_height;
 
+  // The height of the bottom controls.
+  float bottom_controls_height;
+
   // The size of the visible viewport, which may be smaller than the view if the
   // view is partially occluded (e.g. by a virtual keyboard).  The size is in
   // DPI-adjusted pixels.
   gfx::Size visible_viewport_size;
 
   // The resizer rect.
   gfx::Rect resizer_rect;
 
   // Indicates whether tab-initiated fullscreen was granted.
   bool is_fullscreen_granted;
 
   // The display mode.
   blink::WebDisplayMode display_mode;
 
   // If set, requests the renderer to reply with a ViewHostMsg_UpdateRect
   // with the ViewHostMsg_UpdateRect_Flags::IS_RESIZE_ACK bit set in flags.
   bool needs_resize_ack;
 };
 
 }  // namespace content
 
 #endif  // CONTENT_COMMON_RESIZE_PARAMS_H_