cc: Use the correct internal format for glCopyTexImage2D calls.

cc/output/overlay_unittest.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 <stddef.h>
 
 #include <utility>
 
 #include "base/memory/ptr_util.h"
 #include "cc/base/region.h"
@@ skipping 115 matching lines @@
 DefaultOverlayProcessor::DefaultOverlayProcessor(OutputSurface* surface)
     : OverlayProcessor(surface) {
 }
 
 size_t DefaultOverlayProcessor::GetStrategyCount() {
   return strategies_.size();
 }
 
 class OverlayOutputSurface : public OutputSurface {
  public:
-  explicit OverlayOutputSurface(scoped_refptr<ContextProvider> context_provider)
-      : OutputSurface(context_provider, nullptr, nullptr) {
+  explicit OverlayOutputSurface(
+      scoped_refptr<TestContextProvider> context_provider)
+      : OutputSurface(std::move(context_provider), nullptr, nullptr) {
     surface_size_ = kDisplaySize;
     device_scale_factor_ = 1;
     is_displayed_as_overlay_plane_ = true;
   }
 
   void SetScaleFactor(float scale_factor) {
     device_scale_factor_ = scale_factor;
   }
 
   // OutputSurface implementation
   void BindFramebuffer() override {
     OutputSurface::BindFramebuffer();
     bind_framebuffer_count_ += 1;
   }
+  uint32_t GetFramebufferCopyTextureFormat() override {
+    // TestContextProvider has no real framebuffer, just use RGB.
+    return GL_RGB;
+  }
   void SwapBuffers(CompositorFrame* frame) override {
     client_->DidSwapBuffers();
   }
   void OnSwapBuffersComplete() override { client_->DidSwapBuffersComplete(); }
 
   void SetOverlayCandidateValidator(OverlayCandidateValidator* validator) {
     overlay_candidate_validator_.reset(validator);
   }
 
   OverlayCandidateValidator* GetOverlayCandidateValidator() const override {
@@ skipping 1477 matching lines @@
 
   ReturnResourceInUseQuery(resource2);
   ReturnResourceInUseQuery(resource3);
   EXPECT_FALSE(resource_provider_->InUseByConsumer(resource1));
   EXPECT_FALSE(resource_provider_->InUseByConsumer(resource2));
   EXPECT_FALSE(resource_provider_->InUseByConsumer(resource3));
 }
 
 }  // namespace
 }  // namespace cc