Made Blink aware of top controls offset (Chromium-side)

cc/trees/layer_tree_host_impl.h

Index: cc/trees/layer_tree_host_impl.h
diff --git a/cc/trees/layer_tree_host_impl.h b/cc/trees/layer_tree_host_impl.h
index 3a1509f8cfdc829b65eee93bcf779c0be6d15cd3..64e20993ca10a46e7c92eb6d087680bb854c9d79 100644
--- a/cc/trees/layer_tree_host_impl.h
+++ b/cc/trees/layer_tree_host_impl.h
@@ -159,6 +159,8 @@ class CC_EXPORT LayerTreeHostImpl
       ui::LatencyInfo* latency) OVERRIDE;
 
   // TopControlsManagerClient implementation.
+  virtual void SetControlsTopOffset(float offset) OVERRIDE;
+  virtual float ControlsTopOffset() const OVERRIDE;
   virtual void DidChangeTopControlsPosition() OVERRIDE;
   virtual bool HaveRootScrollLayer() const OVERRIDE;
 
@@ -343,11 +345,6 @@ class CC_EXPORT LayerTreeHostImpl
   void SetViewportSize(const gfx::Size& device_viewport_size);
   gfx::Size device_viewport_size() const { return device_viewport_size_; }
 
-  void SetTopControlsLayoutHeight(float top_controls_layout_height);
-  float top_controls_layout_height() const {
-    return top_controls_layout_height_;
-  }
-
   void SetOverhangUIResource(UIResourceId overhang_ui_resource_id,
                              const gfx::Size& overhang_ui_resource_size);
 
@@ -485,6 +482,8 @@ class CC_EXPORT LayerTreeHostImpl
   void GetPictureLayerImplPairs(
       std::vector<PictureLayerImpl::Pair>* layers) const;
 
+  void SetTopControlsLayoutHeight(float height);
+
  protected:
   LayerTreeHostImpl(
       const LayerTreeSettings& settings,
@@ -664,9 +663,6 @@ class CC_EXPORT LayerTreeHostImpl
   UIResourceId overhang_ui_resource_id_;
   gfx::Size overhang_ui_resource_size_;
 
-  // Height of the top controls as known by Blink.
-  float top_controls_layout_height_;
-
   // Optional top-level constraints that can be set by the OutputSurface.
   // - external_transform_ applies a transform above the root layer
   // - external_viewport_ is used DrawProperties, tile management and