Draw the offscreen texture to reflector's surface without extra copy

content/browser/compositor/browser_compositor_output_surface.cc

Index: content/browser/compositor/browser_compositor_output_surface.cc
diff --git a/content/browser/compositor/browser_compositor_output_surface.cc b/content/browser/compositor/browser_compositor_output_surface.cc
index 6839457196ed4eb2fccdf4c621ad2054e5a00b47..072baa5e2517398b15e41f5e25d142db4f5f8a69 100644
--- a/content/browser/compositor/browser_compositor_output_surface.cc
+++ b/content/browser/compositor/browser_compositor_output_surface.cc
@@ -8,6 +8,7 @@
 #include "base/location.h"
 #include "base/strings/string_number_conversions.h"
 #include "content/browser/compositor/browser_compositor_overlay_candidate_validator.h"
+#include "content/browser/compositor/owned_mailbox.h"
 #include "content/browser/compositor/reflector_impl.h"
 #include "content/common/gpu/client/context_provider_command_buffer.h"
 
@@ -80,6 +81,16 @@ void BrowserCompositorOutputSurface::SetReflector(ReflectorImpl* reflector) {
   reflector_ = reflector;
 }
 
+scoped_refptr<OwnedMailbox>
+BrowserCompositorOutputSurface::GetTextureMailbox() {
+  return scoped_refptr<OwnedMailbox>();
+}
+
+base::Closure
+BrowserCompositorOutputSurface::CreateCompositionStartedCallback() {
+  return base::Closure();
+}
+
 cc::OverlayCandidateValidator*
 BrowserCompositorOutputSurface::GetOverlayCandidateValidator() const {
   return overlay_candidate_validator_.get();