cc: Make most of cc::OutputSurface abstract.

blimp/client/support/compositor/blimp_embedder_compositor.cc

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "blimp/client/support/compositor/blimp_embedder_compositor.h"
 
 #include "base/bind.h"
 #include "base/lazy_instance.h"
 #include "base/threading/thread_task_runner_handle.h"
 #include "blimp/client/public/compositor/compositor_dependencies.h"
@@ skipping 29 matching lines @@
 
 class DisplayOutputSurface : public cc::OutputSurface {
  public:
   explicit DisplayOutputSurface(
       scoped_refptr<cc::ContextProvider> context_provider)
       : cc::OutputSurface(std::move(context_provider)) {}
 
   ~DisplayOutputSurface() override = default;
 
   // cc::OutputSurface implementation
+  void EnsureBackbuffer() override {}
+  void DiscardBackbuffer() override {
+    context_provider()->ContextGL()->DiscardBackbufferCHROMIUM();
+  }
+  void BindFramebuffer() override {
+    context_provider()->ContextGL()->BindFramebuffer(GL_FRAMEBUFFER, 0);
+  }
   void SwapBuffers(cc::CompositorFrame frame) override {
     // See cc::OutputSurface::SwapBuffers() comment for details.
     context_provider_->ContextSupport()->Swap();
     cc::OutputSurface::PostSwapBuffersComplete();
   }
-
+  cc::OverlayCandidateValidator* GetOverlayCandidateValidator() const override {
+    return nullptr;
+  }
+  bool IsDisplayedAsOverlayPlane() const override { return false; }
+  unsigned GetOverlayTextureId() const override { return 0; }
+  bool SurfaceIsSuspendForRecycle() const override { return false; }
   uint32_t GetFramebufferCopyTextureFormat() override {
     // We assume we have an alpha channel from the BlimpContextProvider, so use
     // GL_RGBA here.
     return GL_RGBA;
   }
+  bool HasExternalStencilTest() const override { return false; }
+  void ApplyExternalStencil() override {}
 
  private:
   DISALLOW_COPY_AND_ASSIGN(DisplayOutputSurface);
 };
 
 base::LazyInstance<SimpleTaskGraphRunner> g_task_graph_runner =
     LAZY_INSTANCE_INITIALIZER;
 
 }  // namespace
 
@@ skipping 117 matching lines @@
   // The Browser compositor and display share the same context provider.
   auto compositor_frame_sink = base::MakeUnique<cc::DirectCompositorFrameSink>(
       compositor_dependencies_->GetSurfaceManager(),
       surface_id_allocator_.get(), display_.get(), context_provider_, nullptr);
 
   host_->SetCompositorFrameSink(std::move(compositor_frame_sink));
 }
 
 }  // namespace client
 }  // namespace blimp