[CRD iOS] Hook the touch input feedback

remoting/client/render_stub_proxy.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 REMOTING_CLIENT_RENDER_STUB_PROXY_H_
+#define REMOTING_CLIENT_RENDER_STUB_PROXY_H_
+
+#include "base/memory/ref_counted.h"
+#include "base/memory/weak_ptr.h"
+#include "base/single_thread_task_runner.h"
+#include "remoting/client/render_stub.h"
+
+namespace remoting {
+
+class QueuedTaskPoster;
+
+// A class to proxy calls to a RenderStub from one thread to another.
+class RenderStubProxy : public RenderStub {
+ public:
+  // stub: The render stub being wrapped.
+  // task_runner: The task runner that |stub| should be run on.
+  RenderStubProxy(base::WeakPtr<RenderStub> stub,
+                  scoped_refptr<base::SingleThreadTaskRunner> task_runner);
+  ~RenderStubProxy() override;
+
+  // RenderStub overrides.
+  void SetTransformation(const ViewMatrix& transformation) override;
+  void SetCursorPosition(float x, float y) override;
+  void SetCursorVisibility(bool visible) override;
+  void StartInputFeedback(float x, float y, float diameter) override;
+
+ private:
+  void RunTaskOnProperThread(const base::Closure& task,

[nicholss, 2017/05/12 21:42:40]

This method is doing magic task things and I don't understand it. Can you
document it here?

[Yuwei, 2017/05/13 00:41:52]

Done.

+                             bool needs_synchronization);
+
+  base::WeakPtr<RenderStub> stub_;
+  scoped_refptr<base::SingleThreadTaskRunner> task_runner_;
+  std::unique_ptr<remoting::QueuedTaskPoster> ui_task_poster_;
+
+  // RenderStubProxy is neither copyable nor movable.
+  RenderStubProxy(const RenderStubProxy&) = delete;
+  RenderStubProxy& operator=(const RenderStubProxy&) = delete;
+};
+
+}  // namespace remoting
+#endif  // REMOTING_CLIENT_RENDER_STUB_PROXY_H_