Normalize top controls offset to (0, 1), Chromium-side.

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 7db722f61f35a91aa2d19a720bfb4721774fd6c8..f813a364e92d15db4619a69671e08a04d0660bb3 100644
--- a/cc/trees/layer_tree_host.h
+++ b/cc/trees/layer_tree_host.h
@@ -214,7 +214,7 @@ class CC_EXPORT LayerTreeHost {
   void SetViewportSize(const gfx::Size& device_viewport_size);
   void SetTopControlsShrinkBlinkSize(bool shrink);
   void SetTopControlsHeight(float height);
-  void SetTopControlsContentOffset(float offset);
+  void SetTopControlsShownRatio(float ratio);
 
   gfx::Size device_viewport_size() const { return device_viewport_size_; }
 
@@ -418,7 +418,7 @@ class CC_EXPORT LayerTreeHost {
   gfx::Size device_viewport_size_;
   bool top_controls_shrink_blink_size_;
   float top_controls_height_;
-  float top_controls_content_offset_;
+  float top_controls_shown_ratio_;
   float device_scale_factor_;
 
   bool visible_;