Add argument to pass elastic overscroll delta to Blink (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 15 matching lines @@
  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #ifndef WebWidget_h
 #define WebWidget_h
 
 #include "../platform/WebCanvas.h"
 #include "../platform/WebCommon.h"
+#include "../platform/WebFloatSize.h"
 #include "../platform/WebPoint.h"
 #include "../platform/WebRect.h"
 #include "../platform/WebSize.h"
 #include "WebBeginFrameArgs.h"
 #include "WebCompositionUnderline.h"
 #include "WebTextDirection.h"
 #include "WebTextInputInfo.h"
 
 namespace blink {
 
@@ skipping 96 matching lines @@
     virtual void applyViewportDeltas(
         const WebSize& scrollDelta,
         float scaleFactor,
         float topControlsDelta) { }
 
     // Applies viewport related properties during a commit from the compositor
     // thread.
     virtual void applyViewportDeltas(
         const WebSize& pinchViewportDelta,
         const WebSize& mainFrameDelta,
+        const WebFloatSize& elasticOverscrollDelta,
+        float scaleFactor,
+        float topControlsDelta) { }
+    // TODO(ccameron): Delete this when all callers are removed.
+    virtual void applyViewportDeltas(
+        const WebSize& pinchViewportDelta,
+        const WebSize& mainFrameDelta,
         float scaleFactor,
         float topControlsDelta) { }
 
     // 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.
@@ skipping 102 matching lines @@
     // Sets the height subtracted from the Widget to accomodate the top controls.
     virtual void setTopControlsLayoutHeight(float) { }
 
 protected:
     ~WebWidget() { }
 };
 
 } // namespace blink
 
 #endif