[Device Service] Move Gamepad Blink headers to be part of the Gamepad client library

third_party/WebKit/public/platform/WebGamepads.h

-// Copyright (C) 2011, Google Inc. All rights reserved.
-//
-// Redistribution and use in source and binary forms, with or without
-// modification, are permitted provided that the following conditions are met:
-//
-// 1. Redistributions of source code must retain the above copyright
-//    notice, this list of conditions and the following disclaimer.
-// 2. Redistributions in binary form must reproduce the above copyright
-//    notice, this list of conditions and the following disclaimer in the
-//    documentation and/or other materials provided with the distribution.
-//
-// THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS'' AND
-// ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
-// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
-// ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS BE LIABLE
-// FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
-// DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
-// SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
-// CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
-// LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
-// OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
-// DAMAGE.
-
-#ifndef WebGamepads_h
-#define WebGamepads_h
-
-#include "WebGamepad.h"
-
-#pragma pack(push, 4)
-
-namespace blink {
-
-// This structure is intentionally POD and fixed size so that it can be stored
-// in shared memory between hardware polling threads and the rest of the
-// browser.
-class WebGamepads {
- public:
-  static const size_t kItemsLengthCap = 4;
-
-  // Gamepad data for N separate gamepad devices.
-  WebGamepad items[kItemsLengthCap];
-};
-
-#pragma pack(pop)
-}
-
-#endif  // WebGamepads_h