Initial checkin of the new Mozart compositor.

services/gfx/compositor/backend/gpu_rasterizer.h

Index: services/gfx/compositor/backend/gpu_rasterizer.h
diff --git a/services/gfx/compositor/backend/gpu_rasterizer.h b/services/gfx/compositor/backend/gpu_rasterizer.h
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+// Copyright 2015 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 SERVICES_GFX_COMPOSITOR_BACKEND_GPU_RASTERIZER_H_
+#define SERVICES_GFX_COMPOSITOR_BACKEND_GPU_RASTERIZER_H_
+
+#include <memory>
+
+#include "base/callback.h"
+#include "base/macros.h"
+#include "base/memory/ref_counted.h"
+#include "base/memory/weak_ptr.h"
+#include "base/task_runner.h"
+#include "mojo/gpu/gl_context.h"
+#include "mojo/public/cpp/bindings/binding.h"
+#include "mojo/public/cpp/system/functions.h"
+#include "mojo/services/gpu/interfaces/context_provider.mojom.h"
+#include "mojo/skia/ganesh_context.h"
+#include "mojo/skia/ganesh_framebuffer_surface.h"
+#include "services/gfx/compositor/render/painting.h"
+
+namespace compositor {
+
+class RenderFrame;
+class VsyncScheduler;
+
+// Ganesh-based rasterizer which runs on a separate thread from the compositor.
+// Calls into this object, including its creation, must be posted to the
+// correct message loop by the output.
+class GpuRasterizer : public mojo::ViewportParameterListener,
+                      public mojo::GLContext::Observer {
+ public:
+  GpuRasterizer(mojo::ContextProviderPtr context_provider,
+                const std::shared_ptr<VsyncScheduler>& scheduler,
+                const scoped_refptr<base::TaskRunner>& task_runner,
+                const base::Closure& error_callback);
+  ~GpuRasterizer() override;
+
+  void SubmitFrame(const std::shared_ptr<RenderFrame>& frame);
+
+ private:
+  // |ViewportParameterListener|:
+  void OnVSyncParametersUpdated(int64_t timebase, int64_t interval) override;
+
+  // |GLContext::Observer|:
+  void OnContextLost() override;
+
+  void CreateContext();
+  void InitContext(mojo::CommandBufferPtr command_buffer);
+  void DestroyContext();
+  void OnContextProviderConnectionError();
+
+  void Draw();
+
+  void PostErrorCallback();
+
+  mojo::ContextProviderPtr context_provider_;
+  std::shared_ptr<VsyncScheduler> scheduler_;
+  scoped_refptr<base::TaskRunner> task_runner_;
+  base::Closure error_callback_;
+
+  base::WeakPtr<mojo::GLContext> gl_context_;
+  std::unique_ptr<mojo::skia::GaneshContext> ganesh_context_;
+  std::unique_ptr<mojo::skia::GaneshFramebufferSurface> ganesh_surface_;
+  PaintingCache painting_cache_;
+
+  std::shared_ptr<RenderFrame> current_frame_;
+
+  mojo::Binding<ViewportParameterListener> viewport_parameter_listener_binding_;
+
+  DISALLOW_COPY_AND_ASSIGN(GpuRasterizer);
+};
+
+}  // namespace compositor
+
+#endif  // SERVICES_GFX_COMPOSITOR_BACKEND_GPU_RASTERIZER_H_