Move compositor support out of base WebKitPlatformSupport into renderer

content/renderer/renderer_webkitplatformsupport_impl.cc

Index: content/renderer/renderer_webkitplatformsupport_impl.cc
diff --git a/content/renderer/renderer_webkitplatformsupport_impl.cc b/content/renderer/renderer_webkitplatformsupport_impl.cc
index d8ae54681ea7e12f04f877bd9c02cef8b204e5c4..38e58c657e0b325bc0d1d22bd09e1fac01b1497a 100644
--- a/content/renderer/renderer_webkitplatformsupport_impl.cc
+++ b/content/renderer/renderer_webkitplatformsupport_impl.cc
@@ -896,6 +896,11 @@ WebKit::WebGraphicsContext3D* RendererWebKitPlatformSupportImpl::
   return shared_offscreen_context_->Context3d();
 }
 
+WebKit::WebCompositorSupport*
+RendererWebKitPlatformSupportImpl::compositorSupport() {
+  return &compositor_support_;
+}
+
 //------------------------------------------------------------------------------
 
 GrContext* RendererWebKitPlatformSupportImpl::sharedOffscreenGrContext() {