Replace overdraw_bottom_height with top_controls_layout_height.

content/renderer/render_widget.h

Index: content/renderer/render_widget.h
diff --git a/content/renderer/render_widget.h b/content/renderer/render_widget.h
index bd97588d082af4c6fac76ac632063837e651d903..7aa676e06ca5ca8ab8bc7944fadc3126650da672 100644
--- a/content/renderer/render_widget.h
+++ b/content/renderer/render_widget.h
@@ -341,7 +341,7 @@ class CONTENT_EXPORT RenderWidget
   // Resizes the render widget.
   void Resize(const gfx::Size& new_size,
               const gfx::Size& physical_backing_size,
-              float overdraw_bottom_height,
+              float top_controls_layout_height,
               const gfx::Size& visible_viewport_size,
               const gfx::Rect& resizer_rect,
               bool is_fullscreen,
@@ -572,9 +572,9 @@ class CONTENT_EXPORT RenderWidget
   // The size of the view's backing surface in non-DPI-adjusted pixels.
   gfx::Size physical_backing_size_;
 
-  // The height of the physical backing surface that is overdrawn opaquely in
-  // the browser, for example by an on-screen-keyboard (in DPI-adjusted pixels).
-  float overdraw_bottom_height_;
+  // The amount that the viewport size given to Blink was shrunk by the URL-bar
+  // (always 0 on platforms where URL-bar hiding isn't supported).
+  float top_controls_layout_height_;
 
   // The size of the visible viewport in DPI-adjusted pixels.
   gfx::Size visible_viewport_size_;