Add support for calculating the position of the top controls in the cc layer.

cc/compositor_frame_metadata.h

 // Copyright (c) 2012 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_COMPOSITOR_FRAME_METADATA_H_
 #define CC_COMPOSITOR_FRAME_METADATA_H_
 
 #include "cc/cc_export.h"
 #include "ui/gfx/size_f.h"
 #include "ui/gfx/vector2d_f.h"
@@ skipping 11 matching lines @@
   gfx::Vector2dF root_scroll_offset;
   float page_scale_factor;
 
   // These limits can be used together with the scroll/scale fields above to
   // determine if scrolling/scaling in a particular direction is possible.
   gfx::SizeF viewport_size;
   gfx::SizeF root_layer_size;
   float min_page_scale_factor;
   float max_page_scale_factor;
 
-  // Used to position the Android location top bar, whose precise
-  // position is computed by the renderer compositor.
+  // Used to position the Android location top bar and page content, whose
+  // precise position is computed by the renderer compositor.
   gfx::Vector2dF location_bar_offset;
+  gfx::Vector2dF location_bar_content_translation;
 };
 
 }  // namespace cc
 
 #endif  // CC_COMPOSITOR_FRAME_METADATA_H_