Update Gamepad API to match the latest specification

ppapi/shared_impl/ppb_gamepad_shared.cc

Index: ppapi/shared_impl/ppb_gamepad_shared.cc
diff --git a/ppapi/shared_impl/ppb_gamepad_shared.cc b/ppapi/shared_impl/ppb_gamepad_shared.cc
index c45494a00c1c2dd07b4bf9778350ddf583825c7b..c913401481718d967d1b964cd1c0bee5aa64156c 100644
--- a/ppapi/shared_impl/ppb_gamepad_shared.cc
+++ b/ppapi/shared_impl/ppb_gamepad_shared.cc
@@ -18,16 +18,14 @@ void ConvertWebKitGamepadData(const WebKitGamepads& webkit_data,
     if (webkit_pad.connected) {
       COMPILE_ASSERT(sizeof(output_pad.id) == sizeof(webkit_pad.id),
                      id_size_does_not_match);
-      COMPILE_ASSERT(sizeof(output_pad.axes) == sizeof(webkit_pad.axes),
-                     axes_size_does_not_match);
       memcpy(output_pad.id, webkit_pad.id, sizeof(output_pad.id));
       output_pad.timestamp = webkit_pad.timestamp;
       output_pad.axes_length = webkit_pad.axes_length;
-      memcpy(output_pad.axes, webkit_pad.axes, sizeof(output_pad.axes));
+      for (unsigned j = 0; j < webkit_pad.axes_length; ++j)
+        output_pad.axes[j] = static_cast<float>(webkit_pad.axes[j]);
       output_pad.buttons_length = webkit_pad.buttons_length;
-
       for (unsigned j = 0; j < webkit_pad.buttons_length; ++j)
-        output_pad.buttons[j] = webkit_pad.buttons[j].value;
+        output_pad.buttons[j] = static_cast<float>(webkit_pad.buttons[j].value);
     }
   }
 }