Add GetUsbKeyCode dev interface for Pepper key events

ppapi/native_client/src/shared/ppapi_proxy/input_event_data.h

-// Copyright 2011 The Chromium Authors. All rights reserved.
+// Copyright 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 NATIVE_CLIENT_SRC_SHARED_PPAPI_PROXY_INPUT_EVENT_DATA_H_
 #define NATIVE_CLIENT_SRC_SHARED_PPAPI_PROXY_INPUT_EVENT_DATA_H_
 
 #include "native_client/src/include/nacl_macros.h"
 #include "ppapi/c/pp_instance.h"
 #include "ppapi/c/pp_macros.h"
 #include "ppapi/c/pp_rect.h"
@@ skipping 13 matching lines @@
   PP_InputEvent_MouseButton mouse_button;
   int32_t mouse_click_count;
   PP_Point mouse_position;
   PP_Point mouse_movement;
 
   PP_FloatPoint wheel_delta;
   PP_FloatPoint wheel_ticks;
   PP_Bool wheel_scroll_by_page;
 
   uint32_t key_code;
+
+  // The Usage Page (upper 16-bits) and Usage Id (lower 16-bits) that encode

[Wez, 2012/02/19 22:34:22]

nit: Suggest "A code identifying the key by a USB Usage Page & Id.  See ..."

[garykac, 2012/02/21 18:42:21]

Done.

+  // the USB key code for this event. See the "Keyboard/Keypad Page (0x07)" of
+  // the "USB HID Usage Tables" document for encoding details.
+  uint32_t usb_key_code;
+
+  // Required for consistent 64-bit alignment on all platforms.
+  uint32_t unused_padding;
 };
 // Make sure that the size is consistent across platforms, so the alignment is
 // consistent. Note the fields above are carefully ordered to make sure it is
 // consistent. New fields may require some adjustment to keep a consistent size
 // and alignment. TODO(dmichael): This is only required because we don't pickle
 // the type. As a short-cut, we memcpy it instead. It would be cleaner to
 // pickle this struct.
-PP_COMPILE_ASSERT_SIZE_IN_BYTES(InputEventData, 64);
+PP_COMPILE_ASSERT_SIZE_IN_BYTES(InputEventData, 72);
 
 }  // namespace ppapi_proxy
 
 #endif  // NATIVE_CLIENT_SRC_SHARED_PPAPI_PROXY_INPUT_EVENT_DATA_H_