Defer compositor context creation to the thread.

content/renderer/gpu/render_widget_compositor_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 "content/renderer/gpu/render_widget_compositor.h"
 
 #include <utility>
 
 #include "base/location.h"
 #include "base/macros.h"
@@ skipping 130 matching lines @@
 
   std::unique_ptr<cc::OutputSurface> CreateOutputSurface(bool fallback) {
     EXPECT_EQ(num_requests_since_last_success_ >
                   OUTPUT_SURFACE_RETRIES_BEFORE_FALLBACK,
               fallback);
     last_create_was_fallback_ = fallback;
     bool success = num_failures_ >= num_failures_before_success_;
     if (success) {
       std::unique_ptr<cc::TestWebGraphicsContext3D> context =
           cc::TestWebGraphicsContext3D::Create();
-      // Image support required for synchronous compositing.
-      context->set_support_image(true);
       // Create delegating surface so that max_pending_frames = 1.
       return cc::FakeOutputSurface::CreateDelegating3d(std::move(context));
     }
     return use_null_output_surface_
                ? nullptr
                : base::WrapUnique(new cc::FailureOutputSurface(true));
   }
 
   // Force a new output surface to be created.
   void SynchronousComposite() {
@@ skipping 159 matching lines @@
 }
 
 TEST_F(RenderWidgetCompositorOutputSurfaceTest, FallbackSuccessNormalSuccess) {
   // The first success is a fallback, but the next should not be a fallback.
   RunTest(false, RenderWidgetCompositor::OUTPUT_SURFACE_RETRIES_BEFORE_FALLBACK,
           1, 1);
 }
 
 }  // namespace
 }  // namespace content