cc: Make most of cc::OutputSurface abstract.

content/browser/compositor/reflector_impl_unittest.cc

Index: content/browser/compositor/reflector_impl_unittest.cc
diff --git a/content/browser/compositor/reflector_impl_unittest.cc b/content/browser/compositor/reflector_impl_unittest.cc
index a13c5298cef03214f8e589e6d8624fb3250cdce8..6a32e1501eabeccfef6ad3479024cf6a701cef15 100644
--- a/content/browser/compositor/reflector_impl_unittest.cc
+++ b/content/browser/compositor/reflector_impl_unittest.cc
@@ -90,8 +90,14 @@ class TestOutputSurface : public BrowserCompositorOutputSurface {
 
   void SetFlip(bool flip) { capabilities_.flipped_output_surface = flip; }
 
+  void EnsureBackbuffer() override {}
+  void DiscardBackbuffer() override {}
+  void BindFramebuffer() override {}
   void SwapBuffers(cc::CompositorFrame frame) override {}
   uint32_t GetFramebufferCopyTextureFormat() override { return GL_RGB; }
+  bool IsDisplayedAsOverlayPlane() const override { return false; }
+  unsigned GetOverlayTextureId() const override { return 0; }
+  bool SurfaceIsSuspendForRecycle() const override { return false; }
 
   void OnReflectorChanged() override {
     if (!reflector_) {