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

cc/CCLayerTreeHostCommon.cpp

 // Copyright 2011 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 "CCLayerTreeHostCommon.h"
 
 #include "CCLayerImpl.h"
 #include "CCLayerIterator.h"
 #include "CCLayerSorter.h"
 #include "CCMathUtil.h"
 #include "CCRenderSurface.h"
 #include "FloatQuad.h"
 #include "IntRect.h"
 #include "LayerChromium.h"
 #include "RenderSurfaceChromium.h"
 #include <public/WebTransformationMatrix.h>
 
 using WebKit::WebTransformationMatrix;
 
 namespace cc {
 
+CCScrollAndScaleSet::CCScrollAndScaleSet()
+{
+}
+
+CCScrollAndScaleSet::~CCScrollAndScaleSet()
+{
+}
+
 IntRect CCLayerTreeHostCommon::calculateVisibleRect(const IntRect& targetSurfaceRect, const IntRect& layerBoundRect, const WebTransformationMatrix& transform)
 {
     // Is this layer fully contained within the target surface?
     IntRect layerInSurfaceSpace = CCMathUtil::mapClippedRect(transform, layerBoundRect);
     if (targetSurfaceRect.contains(layerInSurfaceSpace))
         return layerBoundRect;
 
     // If the layer doesn't fill up the entire surface, then find the part of
     // the surface rect where the layer could be visible. This avoids trying to
     // project surface rect points that are behind the projection point.
@@ skipping 841 matching lines @@
 
         foundLayer = currentLayer;
         break;
     }
 
     // This can potentially return 0, which means the viewportPoint did not successfully hit test any layers, not even the root layer.
     return foundLayer;
 }
 
 } // namespace cc