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

public/web/WebWidget.h

 /*
  * Copyright (C) 2009 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 120 matching lines @@
     virtual void setCursorVisibilityState(bool isVisible) { }
 
     // Check whether the given point hits any registered touch event handlers.
     virtual bool hasTouchEventHandlersAt(const WebPoint&) { return true; }
 
     // Applies viewport related properties during a commit from the compositor
     // thread.
     virtual void applyViewportDeltas(
         const WebSize& scrollDelta,
         float scaleFactor,
-        float topControlsDelta) { }
+        float topControlsShownRatioDelta) { }
 
     // Applies viewport related properties during a commit from the compositor
     // thread.
     // FIXME: Remove this version once CC side switches to use WebFloatSize version.
     // crbug.com/414283.
     virtual void applyViewportDeltas(
         const WebSize& pinchViewportDelta,
         const WebSize& mainFrameDelta,
         const WebFloatSize& elasticOverscrollDelta,
         float scaleFactor,
-        float topControlsDelta) { }
+        float topControlsShownRatioDelta) { }
 
     // Applies viewport related properties during a commit from the compositor
     // thread.
     virtual void applyViewportDeltas(
         const WebFloatSize& pinchViewportDelta,
         const WebFloatSize& mainFrameDelta,
         const WebFloatSize& elasticOverscrollDelta,
         float scaleFactor,
-        float topControlsDelta) { }
+        float topControlsShownRatioDelta) { }
 
     // Called to inform the WebWidget that mouse capture was lost.
     virtual void mouseCaptureLost() { }
 
     // Called to inform the WebWidget that it has gained or lost keyboard focus.
     virtual void setFocus(bool) { }
 
     // Called to inform the WebWidget of a new composition text.
     // If selectionStart and selectionEnd has the same value, then it indicates
     // the input caret position. If the text is empty, then the existing
@@ skipping 92 matching lines @@
     virtual void didChangeWindowResizerRect() { }
 
     // The page background color. Can be used for filling in areas without
     // content.
     virtual WebColor backgroundColor() const { return 0xFFFFFFFF; /* SK_ColorWHITE */ }
 
     // The currently open page popup, which are calendar and datalist pickers
     // 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 embedder shrunk the WebView size by the top controls height.
+    virtual void setTopControlsHeight(float height, bool topControlsShrinkLayoutSize) { }
+
 protected:
     ~WebWidget() { }
 };
 
 } // namespace blink
 
 #endif