Add a PPB_Flash_Print interface and implement in Chrome.

ppapi/api/private/ppb_flash.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 contains the <code>PPB_Flash</code> interface.
  */
 
 label Chrome {
@@ skipping 99 matching lines @@
   /**
    * Returns whether the given rectangle (in the plugin) is topmost, i.e., above
    * all other web content.
    */
   [version=12.1]
   PP_Bool IsRectTopmost(
       [in] PP_Instance instance,
       [in] PP_Rect rect);
 
   /**
-   * Invokes printing for the given instance.
+   * Does nothing, deprecated. See PPB_Flash_Print.
    */
   [version=12.1]
   int32_t InvokePrinting(
       [in] PP_Instance instance);
 
   /**
    * Indicates that there's activity and, e.g., the screensaver shouldn't kick
    * in.
    */
   [version=12.1]
@@ skipping 28 matching lines @@
   struct PP_Var (*GetProxyForURL)(PP_Instance instance, const char* url);
   int32_t (*Navigate)(PP_Resource request_info,
                       const char* target,
                       bool from_user_action);
   void (*RunMessageLoop)(PP_Instance instance);
   void (*QuitMessageLoop)(PP_Instance instance);
   double (*GetLocalTimeZoneOffset)(PP_Instance instance, PP_Time t);
   struct PP_Var (*GetCommandLineArgs)(PP_Module module);
 };
 #endinl