Add a PPB_Flash_Print interface and implement in Chrome.

ppapi/api/private/ppb_flash_print.idl

Index: ppapi/api/private/ppb_flash_print.idl
diff --git a/ppapi/api/private/ppb_flash_print.idl b/ppapi/api/private/ppb_flash_print.idl
new file mode 100644
index 0000000000000000000000000000000000000000..1961b8b8485bc0e1050cb51213e6061b596777f4
--- /dev/null
+++ b/ppapi/api/private/ppb_flash_print.idl
@@ -0,0 +1,23 @@
+/* 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_Print</code> interface.
+ */
+
+label Chrome {
+  M20 = 1.0
+};
+
+/**
+ * The <code>PPB_Flash_Print</code> interface contains Flash-specific printing
+ * functionality.
+ */
+interface PPB_Flash_Print {
+  /**
+   * Invokes printing on the given plugin instance.
+   */
+  void InvokePrinting([in] PP_Instance instance);
+};