Update Gamepad API to match the latest specification

ppapi/c/ppb_gamepad.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.
  */
 
 /* From ppb_gamepad.idl modified Tue Apr 16 09:04:34 2013. */
 
 #ifndef PPAPI_C_PPB_GAMEPAD_H_
 #define PPAPI_C_PPB_GAMEPAD_H_
 
@@ skipping 21 matching lines @@
  */
 struct PP_GamepadSampleData {
   /**
    * Number of valid elements in the |axes| array.
    */
   uint32_t axes_length;
   /**
    * Normalized values for the axes, indices valid up to |axes_length|-1. Axis
    * values range from -1..1, and are in order of "importance".
    */
-  float axes[16];
+  double axes[16];
   /**
    * Number of valid elements in the |buttons| array.
    */
   uint32_t buttons_length;
   /**
    * Normalized values for the buttons, indices valid up to |buttons_length|
    * - 1. Button values range from 0..1, and are in order of importance.
    */
-  float buttons[32];
+  double buttons[32];
   /**
    * Monotonically increasing value that is incremented when the data have
    * been updated.
    */
   double timestamp;
   /**
    * Identifier for the type of device/manufacturer.
    */
   uint16_t id[128];
   /**
    * Is there a gamepad connected at this index? If this is false, no other
    * data in this structure is valid.
    */
   PP_Bool connected;
   /* Padding to make the struct the same size between 64 and 32. */
   char unused_pad_[4];
 };
-PP_COMPILE_ASSERT_STRUCT_SIZE_IN_BYTES(PP_GamepadSampleData, 472);
+PP_COMPILE_ASSERT_STRUCT_SIZE_IN_BYTES(PP_GamepadSampleData, 672);
 
 /**
  * The data for all gamepads connected to the system.
  */
 struct PP_GamepadsSampleData {
   /**
    * Number of valid elements in the |items| array.
    */
   uint32_t length;
   /* Padding to make the struct the same size between 64 and 32. */
   char unused_pad_[4];
   /**
    * Data for an individual gamepad device connected to the system.
    */
   struct PP_GamepadSampleData items[4];
 };
-PP_COMPILE_ASSERT_STRUCT_SIZE_IN_BYTES(PP_GamepadsSampleData, 1896);
+PP_COMPILE_ASSERT_STRUCT_SIZE_IN_BYTES(PP_GamepadsSampleData, 2696);
 /**
  * @}
  */
 
 /**
  * @addtogroup Interfaces
  * @{
  */
 /**
  * The <code>PPB_Gamepad</code> interface allows retrieving data from
  * gamepad/joystick devices that are connected to the system.
  */
 struct PPB_Gamepad_1_0 {
   /**
    * Samples the current state of the available gamepads.
    */
   void (*Sample)(PP_Instance instance, struct PP_GamepadsSampleData* data);
 };
 
 typedef struct PPB_Gamepad_1_0 PPB_Gamepad;
 /**
  * @}
  */
 
 #endif  /* PPAPI_C_PPB_GAMEPAD_H_ */