Adding run_at to chrome.tabs.executeScript/insertCss.

chrome/common/extensions/extension_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.
 
 // IPC messages for extensions.
 // Multiply-included message file, hence no include guard.
 
 #include "base/shared_memory.h"
 #include "base/values.h"
 #include "chrome/common/extensions/extension.h"
@@ skipping 49 matching lines @@
 
   // Whether the code is JavaScript or CSS.
   IPC_STRUCT_MEMBER(bool, is_javascript)
 
   // String of code to execute.
   IPC_STRUCT_MEMBER(std::string, code)
 
   // Whether to inject into all frames, or only the root frame.
   IPC_STRUCT_MEMBER(bool, all_frames)
 
+  // When to inject the code.
+  IPC_STRUCT_MEMBER(int, run_at)
+
   // Whether to execute code in the main world (as opposed to an isolated
   // world).
   IPC_STRUCT_MEMBER(bool, in_main_world)
 IPC_STRUCT_END()
 
 IPC_STRUCT_TRAITS_BEGIN(WebApplicationInfo::IconInfo)
   IPC_STRUCT_TRAITS_MEMBER(url)
   IPC_STRUCT_TRAITS_MEMBER(width)
   IPC_STRUCT_TRAITS_MEMBER(height)
   IPC_STRUCT_TRAITS_MEMBER(data)
@@ skipping 334 matching lines @@
 
 // Informs the browser there is one less thing keeping the lazy background page
 // alive.
 IPC_MESSAGE_CONTROL1(ExtensionHostMsg_DecrementLazyKeepaliveCount,
                      std::string /* extension_id */)
 
 // Fetches a globally unique ID (for the lifetime of the browser) from the
 // browser process.
 IPC_SYNC_MESSAGE_CONTROL0_1(ExtensionHostMsg_GenerateUniqueID,
                             int /* unique_id */)