cc: Make most of cc::OutputSurface abstract.

android_webview/browser/parent_output_surface.cc

 // Copyright 2014 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 "android_webview/browser/parent_output_surface.h"
 
 #include "android_webview/browser/aw_render_thread_context_provider.h"
 #include "cc/output/compositor_frame.h"
 #include "cc/output/output_surface_client.h"
 #include "gpu/command_buffer/client/gles2_interface.h"
 
 namespace android_webview {
 
 ParentOutputSurface::ParentOutputSurface(
     scoped_refptr<AwRenderThreadContextProvider> context_provider)
     : cc::OutputSurface(std::move(context_provider)) {
   stencil_state_.stencil_test_enabled = false;
 }
 
 ParentOutputSurface::~ParentOutputSurface() {
 }
 
 void ParentOutputSurface::DidLoseOutputSurface() {
   // Android WebView does not handle context loss.
   LOG(FATAL) << "Render thread context loss";
 }
 
+void ParentOutputSurface::EnsureBackbuffer() {}
+
+void ParentOutputSurface::DiscardBackbuffer() {
+  context_provider()->ContextGL()->DiscardBackbufferCHROMIUM();
+}
+
+void ParentOutputSurface::BindFramebuffer() {
+  context_provider()->ContextGL()->BindFramebuffer(GL_FRAMEBUFFER, 0);
+}
+
 void ParentOutputSurface::Reshape(const gfx::Size& size,
                                   float scale_factor,
                                   const gfx::ColorSpace& color_space,
                                   bool has_alpha) {
   DCHECK_EQ(1.f, scale_factor);
   surface_size_ = size;
 }
 
 void ParentOutputSurface::SwapBuffers(cc::CompositorFrame frame) {
   context_provider_->ContextGL()->ShallowFlushCHROMIUM();
@@ skipping 20 matching lines @@
   gl->StencilOpSeparate(GL_BACK, stencil_state_.stencil_back_fail_op,
                         stencil_state_.stencil_back_z_fail_op,
                         stencil_state_.stencil_back_z_pass_op);
 }
 
 uint32_t ParentOutputSurface::GetFramebufferCopyTextureFormat() {
   auto* gl = static_cast<AwRenderThreadContextProvider*>(context_provider());
   return gl->GetCopyTextureInternalFormat();
 }
 
+cc::OverlayCandidateValidator*
+ParentOutputSurface::GetOverlayCandidateValidator() const {
+  return nullptr;
+}
+
+bool ParentOutputSurface::IsDisplayedAsOverlayPlane() const {
+  return false;
+}
+
+unsigned ParentOutputSurface::GetOverlayTextureId() const {
+  return 0;
+}
+
+bool ParentOutputSurface::SurfaceIsSuspendForRecycle() const {
+  return false;
+}
+
 void ParentOutputSurface::SetGLState(const ScopedAppGLStateRestore& gl_state) {
   stencil_state_ = gl_state.stencil_state();
 }
 
 }  // namespace android_webview