Renderer changes for wiring up shared memory with declarative injection

extensions/common/extension_messages.h

 // Copyright 2014 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 <string>
 #include <vector>
 
@@ skipping 388 matching lines @@
 // If |changed_extensions| is not empty, only the extensions in that set will
 // be updated. Otherwise, all extensions that have scripts in the shared memory
 // region will be updated. Note that the empty set => all extensions case is not
 // supported for per-extension programmatically-defined script regions; in such
 // regions, the owner is expected to list itself as the only changed extension.
 IPC_MESSAGE_CONTROL3(ExtensionMsg_UpdateUserScripts,
                      base::SharedMemoryHandle,
                      extensions::ExtensionId /* owner */,
                      std::set<std::string> /* changed extensions */)
 
+// Trigger to execute declarative content script under browser control.
+IPC_MESSAGE_ROUTED4(ExtensionMsg_ExecuteDeclarativeScript,
+                    int /* tab identifier */,
+                    extensions::ExtensionId /* extension identifier */,
+                    int /* script identifier */,
+                    GURL /* page URL where script should be injected */)
+
 // Tell the render view which browser window it's being attached to.
 IPC_MESSAGE_ROUTED1(ExtensionMsg_UpdateBrowserWindowId,
                     int /* id of browser window */)
 
 // Tell the render view what its tab ID is.
 IPC_MESSAGE_ROUTED1(ExtensionMsg_SetTabId,
                     int /* id of tab */)
 
 // Tell the renderer to update an extension's permission set.
 IPC_MESSAGE_CONTROL1(ExtensionMsg_UpdatePermissions,
@@ skipping 292 matching lines @@
                     bool /* is_top_level */,
                     std::string /* name */)
 
 // Tells listeners that a detailed message was reported to the console by
 // WebKit.
 IPC_MESSAGE_ROUTED4(ExtensionHostMsg_DetailedConsoleMessageAdded,
                     base::string16 /* message */,
                     base::string16 /* source */,
                     extensions::StackTrace /* stack trace */,
                     int32 /* severity level */)