Add an interface for Flash to clear its data.

ppapi/api/private/ppp_flash_browser_operations.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>PPP_Flash_BrowserOperations</code> interface.
+ */
+
+label Chrome {
+  M20 = 1.0
+};
+
+/**
+ * This interface allows the browser to request the plugin do things.
+ */
+interface PPP_Flash_BrowserOperations {
+  /**
+   * This function allows the plugin to implement the "Clear site data" feature.
+   *
+   * @profile_dir String containing the directory where the plugin data is

[viettrungluu, 2012/04/11 02:48:10]

I think you should call it "plugin_data_dir" or something like that. Maybe the
comment should also indicate that it's an absolute path?

(Incidentally, does it have a trailing slash/backslash? Probably not, but it may
be best to be clear about this.)

+   * stored. On UTF16 systems (Windows), this will be encoded as UTF-8.
+   *
+   * @arg site String specifying which site to clear the data for. This will
+   * be null to clear data for all sites.
+   *
+   * @arg flags Currently always 0 in Chrome to clear all data. This may be
+   * extended in the future to clear only specific types of data.
+   *
+   * @arg max_age The maximum age in seconds to clear data for. This allows the
+   * plugin to implement "clear past hour" and "clear past data", etc.
+   *
+   * @return PP_TRUE on success, PP_FALSE on failure.
+   *
+   * See also the NPP_ClearSiteData function in NPAPI.
+   * https://wiki.mozilla.org/NPAPI:ClearSiteData
+   */
+  PP_Bool ClearSiteData(str_t profile_dir,
+                        str_t site,
+                        uint64_t flags,
+                        uint64_t max_age);
+};
+