Fix CC*Renderer and CC*LayerImpl to compile with Clang

cc/CCScrollbarAnimationController.cpp

 // Copyright 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "config.h"
 
 #include "CCScrollbarAnimationController.h"
 
 #include "CCScrollbarLayerImpl.h"
 #include <wtf/CurrentTime.h>
@@ skipping 22 matching lines @@
     : m_horizontalScrollbarLayer(0)
     , m_verticalScrollbarLayer(0)
 {
     CCScrollbarAnimationController::updateScrollOffsetAtTime(scrollLayer, 0);
 }
 
 CCScrollbarAnimationController::~CCScrollbarAnimationController()
 {
 }
 
+bool CCScrollbarAnimationController::animate(double)
+{
+    return false;
+}
+
 void CCScrollbarAnimationController::didPinchGestureBegin()
 {
     didPinchGestureBeginAtTime(monotonicallyIncreasingTime());
 }
 
 void CCScrollbarAnimationController::didPinchGestureUpdate()
 {
     didPinchGestureUpdateAtTime(monotonicallyIncreasingTime());
 }
 
@@ skipping 30 matching lines @@
     }
 
     if (m_verticalScrollbarLayer) {
         m_verticalScrollbarLayer->setCurrentPos(m_currentPos.y());
         m_verticalScrollbarLayer->setTotalSize(m_totalSize.height());
         m_verticalScrollbarLayer->setMaximum(m_maximum.height());
     }
 }
 
 } // namespace cc