Revise gamepad interface

webkit/plugins/ppapi/event_conversion.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 WEBKIT_PLUGINS_PPAPI_EVENT_CONVERSION_H_
 #define WEBKIT_PLUGINS_PPAPI_EVENT_CONVERSION_H_
 
 #include <vector>
 
 #include "base/memory/linked_ptr.h"
+#include "ppapi/c/dev/ppb_gamepad_dev.h"
 #include "ppapi/c/ppb_input_event.h"
 #include "third_party/WebKit/Source/WebKit/chromium/public/WebInputEvent.h"
 
 struct PP_InputEvent;
 
 namespace ppapi {
 struct InputEventData;
 }
 
 namespace WebKit {
+class WebGamepads;
 class WebInputEvent;
 }
 
 namespace webkit {
 namespace ppapi {
 
 // Converts the given WebKit event to one or possibly multiple PP_InputEvents.
 // The generated events will be filled into the given vector. On failure, no
 // events will ge generated and the vector will be empty.
 void CreateInputEventData(const WebKit::WebInputEvent& event,
                           std::vector< ::ppapi::InputEventData >* pp_events);
 
 // Creates a WebInputEvent from the given PP_InputEvent.  If it fails, returns
 // NULL.  The caller owns the created object on success.
 WebKit::WebInputEvent* CreateWebInputEvent(
     const ::ppapi::InputEventData& event);
 
 // Creates an array of WebInputEvents to make the given event look like a user
 // input event on all platforms. |plugin_x| and |plugin_y| should be the
 // coordinates of a point within the plugin's area on the page.
 std::vector<linked_ptr<WebKit::WebInputEvent> > CreateSimulatedWebInputEvents(
     const ::ppapi::InputEventData& event,
     int plugin_x,
     int plugin_y);
 
 // Returns the PPAPI event class for the given WebKit event type. The given
 // type should not be "Undefined" since there's no corresponding PPAPI class.
 PP_InputEvent_Class ClassifyInputEvent(WebKit::WebInputEvent::Type type);
 
+// Translate from WebGamepads to the Gamepad API format
+// PP_GamepadsSampleData_Dev.
+void ConvertWebKitGamepadData(WebKit::WebGamepads& webkit_data,
+                              PP_GamepadsSampleData_Dev* output_data);
+
 }  // namespace ppapi
 }  // namespace webkit
 
 #endif  // WEBKIT_PLUGINS_PPAPI_EVENT_CONVERSION_H_