Introduce bottom controls to CC and let it respond to scrolling

cc/trees/layer_tree_host.h

Index: cc/trees/layer_tree_host.h
diff --git a/cc/trees/layer_tree_host.h b/cc/trees/layer_tree_host.h
index d7bb89dc03bae623b977c3fe29d96299e0401739..de3ffae1e32d766d2f1d6c097e5419b060ef8b46 100644
--- a/cc/trees/layer_tree_host.h
+++ b/cc/trees/layer_tree_host.h
@@ -250,6 +250,7 @@ class CC_EXPORT LayerTreeHost : public MutatorHostClient {
   void SetViewportSize(const gfx::Size& device_viewport_size);
   void SetTopControlsHeight(float height, bool shrink);
   void SetTopControlsShownRatio(float ratio);
+  void setBottomControlHeight(float height);

[Khushal, 2016/08/17 04:45:34]

Sorry about the rebase pain. :(

You can move this to LayerTree since all tree specific settings live there now.

 
   gfx::Size device_viewport_size() const { return device_viewport_size_; }
 
@@ -540,6 +541,7 @@ class CC_EXPORT LayerTreeHost : public MutatorHostClient {
   bool top_controls_shrink_blink_size_;
   float top_controls_height_;
   float top_controls_shown_ratio_;
+  float bottom_controls_height_;

[Khushal, 2016/08/17 04:45:34]

Move to LayerTree.

   float device_scale_factor_;
   float painted_device_scale_factor_;