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

public/web/WebWidget.h

Index: public/web/WebWidget.h
diff --git a/public/web/WebWidget.h b/public/web/WebWidget.h
index bc9d4467b2fe0607fb7b6a428ffadd00e6bd4cf0..752391e6b0e85d62f173a7d84bdcc061b8914e8a 100644
--- a/public/web/WebWidget.h
+++ b/public/web/WebWidget.h
@@ -271,9 +271,13 @@ public:
     // but not the select popup.
     virtual WebPagePopup* pagePopup() const { return 0; }
 
-    // Sets the height subtracted from the Widget to accomodate the top controls.
+    // TODO(aelias): Delete this after Blink roll.
     virtual void setTopControlsLayoutHeight(float) { }
 
+    // Notification about the top controls height.  If the boolean is true, then
+    // the viewport was shrunk by the top controls height as of the last Resize.
+    virtual void setTopControlsHeight(float height, bool topControlsShrinkLayoutSize) { }
+
 protected:
     ~WebWidget() { }
 };