Move context-related callbacks into OutputSurface

cc/test/fake_output_surface.cc

Index: cc/test/fake_output_surface.cc
diff --git a/cc/test/fake_output_surface.cc b/cc/test/fake_output_surface.cc
index 6369f61ec6740c4e7bb0c9d53617e5443dadd926..2fe4b5a6eab857937fc9dcbae777ff6f18321b5e 100644
--- a/cc/test/fake_output_surface.cc
+++ b/cc/test/fake_output_surface.cc
@@ -25,15 +25,6 @@ FakeOutputSurface::FakeOutputSurface(
 
 FakeOutputSurface::~FakeOutputSurface() {}
 
-bool FakeOutputSurface::BindToClient(
-    cc::OutputSurfaceClient* client) {
-  DCHECK(client);
-  client_ = client;
-  if (!context3d_)
-    return true;
-  return context3d_->makeContextCurrent();
-}
-
 void FakeOutputSurface::SendFrameToParentCompositor(
     CompositorFrame* frame) {
   frame->AssignTo(&last_sent_frame_);