Decouple GamepadSharedMemory into Blink.

third_party/WebKit/Source/modules/gamepad/GamepadSharedMemoryReader.h

+// Copyright (c) 2011 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 GamepadSharedMemoryReader_h
+#define GamepadSharedMemoryReader_h
+
+#include "device/base/synchronization/shared_memory_seqlock_buffer.h"
+#include "device/gamepad/public/interfaces/gamepad.mojom-blink.h"
+#include "mojo/public/cpp/bindings/binding.h"
+#include "mojo/public/cpp/system/buffer.h"
+#include "public/platform/WebGamepadListener.h"
+#include "public/platform/WebGamepads.h"
+#include "wtf/Noncopyable.h"
+
+namespace blink {
+
+typedef device::SharedMemorySeqLockBuffer<WebGamepads> GamepadHardwareBuffer;
+
+class InterfaceProvider;
+
+class GamepadSharedMemoryReader final
+    : public device::mojom::blink::
+          GamepadObserver {  // heke:export?SampleGamepads..
+  WTF_MAKE_NONCOPYABLE(GamepadSharedMemoryReader);
+
+ public:
+  explicit GamepadSharedMemoryReader(InterfaceProvider*);
+  ~GamepadSharedMemoryReader() override;
+
+  void sampleGamepads(WebGamepads&);
+  void start(WebGamepadListener*);
+  void stop();
+
+ protected:
+  void sendStartMessage();
+  void sendStopMessage();
+
+ private:
+  // device::mojom::blink::GamepadObserver methods.
+  void GamepadConnected(int index, const ::blink::WebGamepad&) override;
+  void GamepadDisconnected(int index, const ::blink::WebGamepad&) override;
+
+  mojo::ScopedSharedBufferHandle m_sharedBufferHandle;
+  mojo::ScopedSharedBufferMapping m_sharedBufferMapping;
+  GamepadHardwareBuffer* m_gamepadHardwareBuffer;
+
+  bool m_everInteracted;
+  bool m_isObserving;
+
+  mojo::Binding<device::mojom::blink::GamepadObserver> m_binding;
+  device::mojom::blink::GamepadMonitorPtr m_gamepadMonitor;
+  WebGamepadListener* m_listener;
+};
+
+}  // namespace blink
+
+#endif  // GamepadSharedMemoryReader_h