aura: Allow in process ContextProvider to hold onscreen contexts.

cc/test/pixel_test.cc

 // Copyright 2013 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 "cc/test/pixel_test.h"
 
 #include "base/path_service.h"
 #include "base/run_loop.h"
 #include "cc/output/compositor_frame_metadata.h"
 #include "cc/output/copy_output_request.h"
@@ skipping 146 matching lines @@
   output_surface_->BindToClient(fake_client_.get());
 
   resource_provider_ = ResourceProvider::Create(output_surface_.get(), 0);
   renderer_ = GLRenderer::Create(fake_client_.get(),
                                  output_surface_.get(),
                                  resource_provider_.get(),
                                  0,
                                  use_skia_gpu_backend).PassAs<DirectRenderer>();
 
   scoped_refptr<webkit::gpu::ContextProviderInProcess> offscreen_contexts =
-      webkit::gpu::ContextProviderInProcess::Create();
+      webkit::gpu::ContextProviderInProcess::CreateOffscreen();
   ASSERT_TRUE(offscreen_contexts->BindToCurrentThread());
   resource_provider_->set_offscreen_context_provider(offscreen_contexts);
 }
 
 void PixelTest::ForceExpandedViewport(gfx::Size surface_expansion,
                                       gfx::Vector2d viewport_offset) {
   static_cast<PixelTestOutputSurface*>(output_surface_.get())
       ->set_surface_expansion_size(surface_expansion);
   static_cast<PixelTestOutputSurface*>(output_surface_.get())
       ->set_viewport_offset(viewport_offset);
@@ skipping 15 matching lines @@
   output_surface_.reset(new PixelTestOutputSurface(device.Pass()));
   output_surface_->BindToClient(fake_client_.get());
   resource_provider_ = ResourceProvider::Create(output_surface_.get(), 0);
   renderer_ = SoftwareRenderer::Create(
       fake_client_.get(),
       output_surface_.get(),
       resource_provider_.get()).PassAs<DirectRenderer>();
 }
 
 }  // namespace cc