views/mus: Install a mus-friend ContextFactory for tests.

ui/compositor/test/fake_context_factory.h

+// Copyright 2017 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.
+
+#ifndef UI_COMPOSITOR_TEST_FAKE_CONTEXT_FACTORY_H_
+#define UI_COMPOSITOR_TEST_FAKE_CONTEXT_FACTORY_H_
+
+#include "cc/test/test_gpu_memory_buffer_manager.h"
+#include "cc/test/test_task_graph_runner.h"
+#include "ui/compositor/compositor.h"
+
+namespace cc {
+class CompositorFrame;
+class ContextProvider;
+class FakeCompositorFrameSink;
+class TestTaskGraphRunner;
+class TestGpuMemoryBufferManager;
+}
+
+namespace ui {
+
+class FakeContextFactory : public ui::ContextFactory {
+ public:
+  FakeContextFactory() = default;
+  ~FakeContextFactory() override = default;
+
+  const cc::CompositorFrame& GetLastCompositorFrame() const;
+
+  // ui::ContextFactory::

[danakj, 2017/03/17 16:54:31]

I think you meant ui::ContextFactory:, though I prefer "ui::ContextFactory
implementation." but either way not the scope operator :)

[sadrul, 2017/03/17 18:59:14]

Whoops. Done!

+  void CreateCompositorFrameSink(
+      base::WeakPtr<ui::Compositor> compositor) override;
+  scoped_refptr<cc::ContextProvider> SharedMainThreadContextProvider() override;
+  void RemoveCompositor(ui::Compositor* compositor) override;
+  bool DoesCreateTestContexts() override;
+  uint32_t GetImageTextureTarget(gfx::BufferFormat format,
+                                 gfx::BufferUsage usage) override;
+  gpu::GpuMemoryBufferManager* GetGpuMemoryBufferManager() override;
+  cc::TaskGraphRunner* GetTaskGraphRunner() override;
+  void AddObserver(ui::ContextFactoryObserver* observer) override;
+  void RemoveObserver(ui::ContextFactoryObserver* observer) override;
+
+ private:
+  cc::FakeCompositorFrameSink* frame_sink_ = nullptr;
+  cc::TestTaskGraphRunner task_graph_runner_;
+  cc::TestGpuMemoryBufferManager gpu_memory_buffer_manager_;
+
+  DISALLOW_COPY_AND_ASSIGN(FakeContextFactory);
+};
+
+}  // namespace ui
+
+#endif  // UI_COMPOSITOR_TEST_FAKE_CONTEXT_FACTORY_H_