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

cc/CCRenderer.h

 // 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.
 
 #ifndef CCRenderer_h
 #define CCRenderer_h
 
 #include "CCLayerTreeHost.h"
 #include "CCRenderPass.h"
 #include "FloatQuad.h"
@@ skipping 34 matching lines @@
 
     const CCLayerTreeSettings& settings() const { return m_client->settings(); }
 
     const IntSize& viewportSize() { return m_client->deviceViewportSize(); }
     int viewportWidth() { return viewportSize().width(); }
     int viewportHeight() { return viewportSize().height(); }
 
     virtual void viewportChanged() { }
 
     virtual void decideRenderPassAllocationsForFrame(const CCRenderPassList&) { }
-    virtual bool haveCachedResourcesForRenderPassId(CCRenderPass::Id) const { return false; }
+    virtual bool haveCachedResourcesForRenderPassId(CCRenderPass::Id) const;
 
     virtual void drawFrame(const CCRenderPassList&, const CCRenderPassIdHashMap&) = 0;
 
     // waits for rendering to finish
     virtual void finish() = 0;
 
     virtual void doNoOp() { }
     // puts backbuffer onscreen
     virtual bool swapBuffers() = 0;
 
     virtual void getFramebufferPixels(void *pixels, const IntRect&) = 0;
 
-    virtual bool isContextLost() { return false; }
+    virtual bool isContextLost();
 
     virtual void setVisible(bool) = 0;
 
 protected:
     explicit CCRenderer(CCRendererClient* client)
         : m_client(client)
     {
     }
 
     CCRendererClient* m_client;
 };
 
 }
 
 #endif // CCRenderer_h