Add GetUsbKeyCode dev interface for Pepper key events

ppapi/api/dev/ppb_keyboard_input_event_dev.idl

+/* 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.
+ */
+
+/**
+ * This file defines the <code>PPB_KeyboardInputEvent_Dev</code> interface,
+ * which provides access to the raw USB scancodes for key input events.
+ */
+
+label Chrome {
+  M19 = 0.1
+};
+
+/**
+ * The <code>PPB_KeyboardInputEvent_Dev</code> interface is an extension to the
+ * PPB_KeyboardInputEvent</code> interface that provides
+ */
+[version=0.1, macro="PPB_KEYBOARD_INPUT_EVENT_DEV_INTERFACE"]
+interface PPB_KeyboardInputEvent_Dev {
+  /**
+   * This sets the usb_scan_code in the given <code>resource</code>. It is
+   * intended that this method be called immediately after any call to
+   * <code>Create</code>.
+   *
+   * When GetUsbScanCode moves out of this _Dev interface, then the
+   * <code>usb_scan_code</code> param will be added to the <code>Create</code>
+   * method and this method will be removed.
+   *
+   * @param[in] key_event A <code>PP_Resource</code> created by
+   * <code>PPB_KeyboardInputEvent</code>'s <code>Create</code> method.
+   *
+   * @param[in] usb_scan_code The USB scancode to assign for this
+   * <code>key_event</code>.
+   *
+   * @return <code>PP_TRUE</code> if the usb scancode was set successfully.
+   */
+  PP_Bool SetUsbScanCode([in] PP_Resource key_event,
+                         [in] uint32_t usb_scan_code);
+
+  /**
+   * GetUsbScanCode() returns the USB scancode that corresponds to the key
+   * that generated this keyboard event.
+   *
+   * @param[in] key_event A <code>PP_Resource</code> corresponding to a
+   * keyboard event.
+   *
+   * @return The USB scancode field for the keyboard event.
+   */
+  uint32_t GetUsbScanCode([in] PP_Resource key_event);
+};