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

cc/trees/layer_tree_host_common.h

Index: cc/trees/layer_tree_host_common.h
diff --git a/cc/trees/layer_tree_host_common.h b/cc/trees/layer_tree_host_common.h
index c86c4aa2c788a58820e1464923a07bcc706af6a2..39467277b2b24c8bea5e73c2e3f3943371c738c8 100644
--- a/cc/trees/layer_tree_host_common.h
+++ b/cc/trees/layer_tree_host_common.h
@@ -140,6 +140,7 @@ struct CC_EXPORT ScrollAndScaleSet {
 
   std::vector<LayerTreeHostCommon::ScrollUpdateInfo> scrolls;
   float page_scale_delta;
+  int top_controls_content_offset;

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

scrolls and page scale updates in this struct are deltas, can this one be as
well for consistency?

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

Yup, though I think the value that gets sent to Blink will should still be
offset+delta (for the reason mentioned in my comment in render_widget)

[bokan, 2014/09/02 18:57:16]

Just realized doing this has the same problem with RenderWidget::Resize causing
a double application of the sent delta, I'll wait until we clear that up.

   ScopedPtrVector<SwapPromise> swap_promises;
 };