Fix main thread top controls scrolling to mirror CC.

content/renderer/render_view_impl.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 CONTENT_RENDERER_RENDER_VIEW_IMPL_H_
 #define CONTENT_RENDERER_RENDER_VIEW_IMPL_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 845 matching lines @@
 
   // Indicates whether this view overrides url-based zoom settings.
   bool uses_temporary_zoom_level_;
 
 #if defined(OS_ANDROID)
   // Cache the old top controls state constraints. Used when updating
   // current value only without altering the constraints.
   TopControlsState top_controls_constraints_;
 #endif
 
+  // Whether or not Blink's viewport size should be shrunk by the height of the
+  // URL-bar.
+  bool top_controls_shrink_blink_size_;
+
+  // The height of the top controls.
+  float top_controls_height_;
+
   // Indicates whether this page has been focused/unfocused by the browser.
   bool has_focus_;
 
   // View ----------------------------------------------------------------------
 
   // Cache the preferred size of the page in order to prevent sending the IPC
   // when layout() recomputes but doesn't actually change sizes.
   gfx::Size preferred_size_;
 
   // Used to delay determining the preferred size (to avoid intermediate
@@ skipping 109 matching lines @@
   // use the Observer interface to filter IPC messages and receive frame change
   // notifications.
   // ---------------------------------------------------------------------------
 
   DISALLOW_COPY_AND_ASSIGN(RenderViewImpl);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_RENDER_VIEW_IMPL_H_