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

cc/trees/layer_tree_host_client.h

Index: cc/trees/layer_tree_host_client.h
diff --git a/cc/trees/layer_tree_host_client.h b/cc/trees/layer_tree_host_client.h
index 5d51fafefb7eab2c9c03186d4293ff382ee6ed30..350347605f7863871db75de2b836a86c4159bb73 100644
--- a/cc/trees/layer_tree_host_client.h
+++ b/cc/trees/layer_tree_host_client.h
@@ -29,6 +29,10 @@ class LayerTreeHostClient {
   virtual void Layout() = 0;
   virtual void ApplyScrollAndScale(const gfx::Vector2d& scroll_delta,
                                    float page_scale) = 0;
+  // TODO(bokan): This method is a shim while we need to keep both
+  // virtual-viewport and ordinary pinch modes around. It will be removed in
+  // place of the above method once we remove old-style pinch.
+  virtual void SetTopControlsContentOffset(int offset) = 0;

[aelias_OOO_until_Jul13, 2014/08/29 04:37:01]

I think if you stop baking this value into FrameView size (mentioned below how
we can avoid it) we can use floats everywhere instead of ints.

[bokan, 2014/08/29 18:02:14]

Assuming this can be done impl-side then yes. See my concerns about that in
comment in render_widget.

   // Creates an OutputSurface. If fallback is true, it should attempt to
   // create an OutputSurface that is guaranteed to initialize correctly.
   virtual scoped_ptr<OutputSurface> CreateOutputSurface(bool fallback) = 0;