Pepper: Log in UMA when an interface is used.

ppapi/proxy/ppapi_messages.h

 // 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.
 
 // Multiply-included message header, no traditional include guard.
 #include <map>
 #include <string>
 #include <vector>
 
 #include "base/basictypes.h"
@@ skipping 404 matching lines @@
 // Passes the WebKit preferences to the plugin.
 IPC_MESSAGE_CONTROL1(PpapiMsg_SetPreferences,
                      ppapi::Preferences)
 
 // Sent in both directions to see if the other side supports the given
 // interface.
 IPC_SYNC_MESSAGE_CONTROL1_1(PpapiMsg_SupportsInterface,
                             std::string /* interface_name */,
                             bool /* result */)
 
+IPC_MESSAGE_CONTROL1(PpapiHostMsg_LogInterfaceUsage,
+                     int /* interface_hash */)
+
 #if !defined(OS_NACL) && !defined(NACL_WIN64)
 // Network state notification from the browser for implementing
 // PPP_NetworkState_Dev.
 IPC_MESSAGE_CONTROL1(PpapiMsg_SetNetworkState,
                      bool /* online */)
 
 // Requests a list of sites that have data stored from the plugin. The plugin
 // process will respond with PpapiHostMsg_GetSitesWithDataResult. This is used
 // for Flash.
 IPC_MESSAGE_CONTROL2(PpapiMsg_GetSitesWithData,
@@ skipping 1623 matching lines @@
 IPC_MESSAGE_CONTROL1(PpapiHostMsg_Talk_RequestPermission,
                      PP_TalkPermission /* permission */)
 IPC_MESSAGE_CONTROL0(PpapiPluginMsg_Talk_RequestPermissionReply)
 IPC_MESSAGE_CONTROL0(PpapiHostMsg_Talk_StartRemoting)
 IPC_MESSAGE_CONTROL0(PpapiPluginMsg_Talk_StartRemotingReply)
 IPC_MESSAGE_CONTROL0(PpapiHostMsg_Talk_StopRemoting)
 IPC_MESSAGE_CONTROL0(PpapiPluginMsg_Talk_StopRemotingReply)
 IPC_MESSAGE_CONTROL1(PpapiPluginMsg_Talk_NotifyEvent, PP_TalkEvent /* event */)
 
 #endif  // !defined(OS_NACL) && !defined(NACL_WIN64)