Fix remaining cc files to compile with Clang

cc/HeadsUpDisplayLayerChromium.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 "HeadsUpDisplayLayerChromium.h"
 
 #include "CCHeadsUpDisplayLayerImpl.h"
 #include "CCLayerTreeHost.h"
@@ skipping 27 matching lines @@
         bounds.setWidth(std::min(maxTextureSize, layerTreeHost()->deviceViewportSize().width()));
         bounds.setHeight(std::min(maxTextureSize, layerTreeHost()->deviceViewportSize().height()));
     } else {
         bounds.setWidth(512);
         bounds.setHeight(128);
     }
 
     setBounds(bounds);
 }
 
+bool HeadsUpDisplayLayerChromium::drawsContent() const
+{
+    return true;
+}
+
 void HeadsUpDisplayLayerChromium::setFontAtlas(PassOwnPtr<CCFontAtlas> fontAtlas)
 {
     m_fontAtlas = fontAtlas;
     setNeedsCommit();
 }
 
 PassOwnPtr<CCLayerImpl> HeadsUpDisplayLayerChromium::createCCLayerImpl()
 {
     return CCHeadsUpDisplayLayerImpl::create(m_layerId);
 }
 
 void HeadsUpDisplayLayerChromium::pushPropertiesTo(CCLayerImpl* layerImpl)
 {
     LayerChromium::pushPropertiesTo(layerImpl);
 
     if (!m_fontAtlas)
         return;
 
     CCHeadsUpDisplayLayerImpl* hudLayerImpl = static_cast<CCHeadsUpDisplayLayerImpl*>(layerImpl);
     hudLayerImpl->setFontAtlas(m_fontAtlas.release());
 }
 
 }