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 0b9a6d3dd98d3fd65febf22d8343cfaf078bed9d..b99873dbc84f073318d56e5c2d6aa3c3a7f3e1a5 100644
--- a/cc/test/fake_output_surface.cc
+++ b/cc/test/fake_output_surface.cc
@@ -22,15 +22,6 @@ 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_);