[Remoting Android] Refactor CursorShapeStubProxy from JniDisplayHandler

remoting/client/cursor_shape_stub_proxy.h

+// 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 REMOTING_CLIENT_CURSOR_SHAPE_STUB_PROXY_H_
+#define REMOTING_CLIENT_CURSOR_SHAPE_STUB_PROXY_H_
+
+#include "base/macros.h"
+#include "base/memory/weak_ptr.h"
+#include "base/single_thread_task_runner.h"
+#include "remoting/protocol/cursor_shape_stub.h"
+
+namespace remoting {
+
+// A helper class to forward CursorShapeStub function calls from one thread to
+// another.
+class CursorShapeStubProxy : public protocol::CursorShapeStub {
+ public:
+  // Function calls will be forwarded to |stub| on the thread of |task_runner|.
+  CursorShapeStubProxy(
+      base::WeakPtr<protocol::CursorShapeStub> stub,
+      scoped_refptr<base::SingleThreadTaskRunner> task_runner);
+  ~CursorShapeStubProxy() override;
+
+  // CursorShapeStub override.
+  void SetCursorShape(const protocol::CursorShapeInfo& cursor_shape) override;
+
+ private:
+  base::WeakPtr<protocol::CursorShapeStub> stub_;
+  scoped_refptr<base::SingleThreadTaskRunner> task_runner_;
+
+  DISALLOW_COPY_AND_ASSIGN(CursorShapeStubProxy);
+};
+
+}  // namespace remoting
+
+#endif  // REMOTING_CLIENT_CURSOR_SHAPE_STUB_PROXY_H_