Update Gamepad API to match the latest specification

ppapi/api/ppb_gamepad.idl

Index: ppapi/api/ppb_gamepad.idl
diff --git a/ppapi/api/ppb_gamepad.idl b/ppapi/api/ppb_gamepad.idl
index 1552fd67d7101881800ae992b129e086b1aaa6e6..50e2107cfdb04c73dad303f38b7a36159a778546 100644
--- a/ppapi/api/ppb_gamepad.idl
+++ b/ppapi/api/ppb_gamepad.idl
@@ -17,7 +17,7 @@ label Chrome {
 /**
  * The data for one gamepad device.
  */
-[assert_size(472)]
+[assert_size(672)]
 struct PP_GamepadSampleData {
     /**
      * Number of valid elements in the |axes| array.
@@ -28,7 +28,7 @@ struct PP_GamepadSampleData {
      * 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_t[16] axes;
+    double_t[16] axes;
 
     /**
      * Number of valid elements in the |buttons| array.
@@ -39,7 +39,7 @@ struct PP_GamepadSampleData {
      * 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_t[32] buttons;
+    double_t[32] buttons;
 
     /**
      * Monotonically increasing value that is incremented when the data have
@@ -65,7 +65,7 @@ struct PP_GamepadSampleData {
 /**
  * The data for all gamepads connected to the system.
  */
-[assert_size(1896)]
+[assert_size(2696)]
 struct PP_GamepadsSampleData {
     /**
      * Number of valid elements in the |items| array.