cc/blimp: Add a LayerTreeHostRemote implementation.

cc/blimp/layer_tree_host_remote.h

Index: cc/blimp/layer_tree_host_remote.h
diff --git a/cc/blimp/layer_tree_host_remote.h b/cc/blimp/layer_tree_host_remote.h
new file mode 100644
index 0000000000000000000000000000000000000000..dfe66c5d1ac42ee9520ec64727668d9a566a0bfc
--- /dev/null
+++ b/cc/blimp/layer_tree_host_remote.h
@@ -0,0 +1,153 @@
+// Copyright 2016 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 CC_BLIMP_LAYER_TREE_HOST_REMOTE_H_
+#define CC_BLIMP_LAYER_TREE_HOST_REMOTE_H_
+
+#include "base/macros.h"
+#include "base/memory/ref_counted.h"
+#include "cc/base/cc_export.h"
+#include "cc/blimp/compositor_proto_state_sink_client.h"
+#include "cc/debug/layer_tree_debug_state.h"
+#include "cc/trees/layer_tree_host.h"
+#include "cc/trees/layer_tree_settings.h"
+#include "cc/trees/surface_sequence_generator.h"
+#include "cc/trees/swap_promise_manager.h"
+
+namespace base {
+class SingleThreadTaskRunner;
+}  // namespace base
+
+namespace cc {
+class AnimationHost;
+class CompositorProtoStateSink;
+class LayerTreeHostClient;
+
+class CC_EXPORT LayerTreeHostRemote : public LayerTreeHost,
+                                      public CompositorProtoStateSinkClient {
+ public:
+  // The remote LayerTreeHost doesn't perform any compositing, so we don't need
+  // any resources (OutputSurface, TaskGraphRunner, etc.) needed by the
+  // compositor.
+  struct InitParams {
+    LayerTreeHostClient* client = nullptr;
+    scoped_refptr<base::SingleThreadTaskRunner> main_task_runner;
+    std::unique_ptr<AnimationHost> animation_host;
+    std::unique_ptr<CompositorProtoStateSink> compositor_proto_state_sink;
+    LayerTreeSettings const* settings = nullptr;
+
+    InitParams();
+    ~InitParams();
+  };
+
+  explicit LayerTreeHostRemote(InitParams* params);
+  ~LayerTreeHostRemote() override;
+
+  // LayerTreeHost implementation.
+  int GetId() const override;
+  int SourceFrameNumber() const override;
+  LayerTree* GetLayerTree() override;
+  const LayerTree* GetLayerTree() const override;
+  UIResourceManager* GetUIResourceManager() override;
+  TaskRunnerProvider* GetTaskRunnerProvider() const override;
+  const LayerTreeSettings& GetSettings() const override;
+  void SetSurfaceClientId(uint32_t client_id) override;
+  void SetLayerTreeMutator(std::unique_ptr<LayerTreeMutator> mutator) override;
+  void QueueSwapPromise(std::unique_ptr<SwapPromise> swap_promise) override;
+  SwapPromiseManager* GetSwapPromiseManager() override;
+  void SetHasGpuRasterizationTrigger(bool has_trigger) override;
+  void SetVisible(bool visible) override;
+  bool IsVisible() const override;
+  void SetCompositorFrameSink(
+      std::unique_ptr<CompositorFrameSink> compositor_frame_sink) override;
+  std::unique_ptr<CompositorFrameSink> ReleaseCompositorFrameSink() override;
+  void SetNeedsAnimate() override;
+  void SetNeedsUpdateLayers() override;
+  void SetNeedsCommit() override;
+  bool BeginMainFrameRequested() const override;
+  bool CommitRequested() const override;
+  void SetDeferCommits(bool defer_commits) override;
+  void LayoutAndUpdateLayers() override;
+  void Composite(base::TimeTicks frame_begin_time) override;
+  void SetNeedsRedraw() override;
+  void SetNeedsRedrawRect(const gfx::Rect& damage_rect) override;
+  void SetNextCommitForcesRedraw() override;
+  void NotifyInputThrottledUntilCommit() override;
+  void UpdateTopControlsState(TopControlsState constraints,
+                              TopControlsState current,
+                              bool animate) override;
+  const base::WeakPtr<InputHandler>& GetInputHandler() const override;
+  void DidStopFlinging() override;
+  void SetDebugState(const LayerTreeDebugState& debug_state) override;
+  const LayerTreeDebugState& GetDebugState() const override;
+  int ScheduleMicroBenchmark(
+      const std::string& benchmark_name,
+      std::unique_ptr<base::Value> value,
+      const MicroBenchmark::DoneCallback& callback) override;
+  bool SendMessageToMicroBenchmark(int id,
+                                   std::unique_ptr<base::Value> value) override;
+  SurfaceSequenceGenerator* GetSurfaceSequenceGenerator() override;
+  void SetNextCommitWaitsForActivation() override;
+  void ResetGpuRasterizationTracking() override;
+
+ protected:
+  // Protected for testing. Allows tests to inject the LayerTree.
+  LayerTreeHostRemote(InitParams* params,
+                      std::unique_ptr<LayerTree> layer_tree);
+
+ private:
+  enum class FramePipelineStage { NONE, ANIMATE, UPDATE_LAYERS, COMMIT };
+
+  // CompositorProtoStateSinkClient implementation.
+  void BeginMainFrame() override;
+  base::SingleThreadTaskRunner* GetMainTaskRunner() override;
+
+  void MainFrameRequested(FramePipelineStage requested_pipeline_stage);
+  void ScheduleMainFrameIfNecessary();
+  void MainFrameComplete();
+  void DispatchDrawAndSwapCallbacks();
+
+  int id_;
+  int source_frame_number_;
+  bool visible_;
+  bool defer_commits_;
+
+  // Set to true if a main frame request is pending on the
+  // CompositorProtoStateSink.
+  bool main_frame_requested_from_state_sink_;
+
+  // Set to the pipeline stage we are currently at if we are inside a main frame
+  // update.
+  FramePipelineStage current_pipeline_stage_;
+
+  // Set to the pipeline stage we need to go to for the current main frame
+  // update, if we are inside a main frame update.
+  FramePipelineStage max_pipeline_stage_for_current_frame_;
+
+  // Set to the pipeline stage requested for the next BeginMainFrame.
+  FramePipelineStage requested_pipeline_stage_for_next_frame_;
+
+  LayerTreeHostClient* client_;
+  std::unique_ptr<TaskRunnerProvider> task_runner_provider_;
+
+  // The CompositorProtoStateSink used to submit frame updates to the client.
+  std::unique_ptr<CompositorProtoStateSink> compositor_proto_state_sink_;
+
+  LayerTreeSettings settings_;
+  LayerTreeDebugState debug_state_;
+
+  // The LayerTree holds the root layer and other state on the engine.
+  std::unique_ptr<LayerTree> layer_tree_;
+
+  SwapPromiseManager swap_promise_manager_;
+  SurfaceSequenceGenerator surface_sequence_generator_;
+
+  base::WeakPtr<InputHandler> input_handler_weak_ptr_;
+
+  base::WeakPtrFactory<LayerTreeHostRemote> weak_factory_;
+};
+
+}  // namespace cc
+
+#endif  // CC_BLIMP_LAYER_TREE_HOST_REMOTE_H_