Add Mac gamepad input remapper

content/browser/gamepad/platform_data_fetcher_mac.h

 // Copyright (c) 2012 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 CONTENT_BROWSER_GAMEPAD_DATA_FETCHER_MAC_H_
 #define CONTENT_BROWSER_GAMEPAD_DATA_FETCHER_MAC_H_
 
 #include "build/build_config.h"
 
 #include "base/compiler_specific.h"
 #include "base/mac/scoped_cftyperef.h"
 #include "content/browser/gamepad/data_fetcher.h"
+#include "content/browser/gamepad/gamepad_standard_mappings.h"
 #include "content/common/gamepad_hardware_buffer.h"
 
 #include <CoreFoundation/CoreFoundation.h>
 #include <IOKit/hid/IOHIDManager.h>
 
 #if defined(__OBJC__)
 @class NSArray;
 #else
 class NSArray;
 #endif
@@ skipping 36 matching lines @@
   WebKit::WebGamepads data_;
 
   // Side-band data that's not passed to the consumer, but we need to maintain
   // to update data_.
   struct AssociatedData {
     IOHIDDeviceRef device_ref;
     IOHIDElementRef button_elements[WebKit::WebGamepad::buttonsLengthCap];
     IOHIDElementRef axis_elements[WebKit::WebGamepad::buttonsLengthCap];
     CFIndex axis_minimums[WebKit::WebGamepad::axesLengthCap];
     CFIndex axis_maximums[WebKit::WebGamepad::axesLengthCap];
+    // Function to map from device data to standard layout, if available. May
+    // be null if no mapping is available.
+    GamepadStandardMappingFunction mapper;
   };
   AssociatedData associated_[WebKit::WebGamepads::itemsLengthCap];
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_GAMEPAD_DATA_FETCHER_MAC_H_