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/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)

[darin (slow to review), 2011/12/15 05:22:23]

how about putting all of this gunk into a data_fetcher.h file?

 #include "content/browser/gamepad/data_fetcher_win.h"
 #elif defined(OS_MACOSX)
 #include "content/browser/gamepad/data_fetcher_mac.h"
+#elif defined(OS_LINUX)
+#include "content/browser/gamepad/data_fetcher_linux.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;

[darin (slow to review), 2011/12/15 05:22:23]

why is the typedef from FooBarWindows to FooPlatformBar?  is the "Platform" bit
helpful?  if so, shouldn't it be in the platform-specific names too?

 
 #elif defined(OS_MACOSX)
 
 typedef GamepadDataFetcherMac GamepadPlatformDataFetcher;
 
+#elif defined(OS_LINUX)
+
+typedef GamepadDataFetcherLinux GamepadPlatformDataFetcher;
+
 #else
 
 class GamepadEmptyDataFetcher : public GamepadDataFetcher {
  public:
   void GetGamepadData(WebKit::WebGamepads* pads, bool) {
     pads->length = 0;
   }
 };
 typedef GamepadEmptyDataFetcher GamepadPlatformDataFetcher;
 
@@ skipping 121 matching lines @@
       kDesiredSamplingIntervalMs);
 }
 
 GamepadHardwareBuffer* GamepadProvider::SharedMemoryAsHardwareBuffer() {
   void* mem = gamepad_shared_memory_.memory();
   DCHECK(mem);
   return static_cast<GamepadHardwareBuffer*>(mem);
 }
 
 }  // namespace content