Move paint code from RenderImage/RenderVideo into ImagePainter/VideoPainter.

Source/core/rendering/RenderVideo.h

Index: Source/core/rendering/RenderVideo.h
diff --git a/Source/core/rendering/RenderVideo.h b/Source/core/rendering/RenderVideo.h
index 6b6e2b3eca859bec26d1cba38eff2f61e976cfcd..db9e19b3245d7b776ca0e69ad7cd7a5f8ac2a546 100644
--- a/Source/core/rendering/RenderVideo.h
+++ b/Source/core/rendering/RenderVideo.h
@@ -44,10 +44,11 @@ public:
     bool supportsAcceleratedRendering() const;
 
     bool shouldDisplayVideo() const;
+    HTMLVideoElement* videoElement() const;
+    bool acceleratedRenderingInUse();
 
 private:
     virtual void updateFromElement() OVERRIDE;
-    inline HTMLVideoElement* videoElement() const;
 
     virtual void intrinsicSizeChanged() OVERRIDE;
     LayoutSize calculateIntrinsicSize();
@@ -76,7 +77,6 @@ private:
 
     void updatePlayer();
 
-    bool acceleratedRenderingInUse();
 
     LayoutSize m_cachedImageSize;
 };