Add gamepad data fetcher for Linux

content/browser/gamepad/gamepad_provider.cc

 // 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.
 
 #include <cmath>
 #include <set>
 #include <vector>
 
 #include "base/bind.h"
 #include "base/logging.h"
 #include "base/message_loop.h"
 #include "base/task.h"
 #include "base/threading/thread.h"
 #include "base/threading/thread_restrictions.h"
+#include "content/browser/gamepad/data_fetcher.h"
+#include "content/browser/gamepad/gamepad_provider.h"
+#include "content/browser/gamepad/platform_data_fetcher.h"
+#include "content/common/gamepad_messages.h"
 #include "content/public/browser/browser_thread.h"
-#include "content/browser/gamepad/gamepad_provider.h"
-#include "content/browser/gamepad/data_fetcher.h"
-#include "content/common/gamepad_messages.h"
-
-#if defined(OS_WIN)
-#include "content/browser/gamepad/data_fetcher_win.h"
-#elif defined(OS_MACOSX)
-#include "content/browser/gamepad/data_fetcher_mac.h"
-#endif
 
 namespace content {
 
-// Define the default data fetcher that GamepadProvider will use if none is
-// supplied. (GamepadPlatformDataFetcher).
-#if defined(OS_WIN)
-
-typedef GamepadDataFetcherWindows GamepadPlatformDataFetcher;
-
-#elif defined(OS_MACOSX)
-
-typedef GamepadDataFetcherMac GamepadPlatformDataFetcher;
-
-#else
-
-class GamepadEmptyDataFetcher : public GamepadDataFetcher {
- public:
-  void GetGamepadData(WebKit::WebGamepads* pads, bool) {
-    pads->length = 0;
-  }
-};
-typedef GamepadEmptyDataFetcher GamepadPlatformDataFetcher;
-
-#endif
-
 GamepadProvider::GamepadProvider(GamepadDataFetcher* fetcher)
     : is_paused_(false),
       devices_changed_(true),
       provided_fetcher_(fetcher),
       ALLOW_THIS_IN_INITIALIZER_LIST(weak_factory_(this)) {
   size_t data_size = sizeof(GamepadHardwareBuffer);
   base::SystemMonitor* monitor = base::SystemMonitor::Get();
   if (monitor)
     monitor->AddDevicesChangedObserver(this);
   gamepad_shared_memory_.CreateAndMapAnonymous(data_size);
@@ skipping 109 matching lines @@
       kDesiredSamplingIntervalMs);
 }
 
 GamepadHardwareBuffer* GamepadProvider::SharedMemoryAsHardwareBuffer() {
   void* mem = gamepad_shared_memory_.memory();
   DCHECK(mem);
   return static_cast<GamepadHardwareBuffer*>(mem);
 }
 
 }  // namespace content