Block content scripts from executing until user grants permission

extensions/common/extension_messages.h

Index: extensions/common/extension_messages.h
diff --git a/extensions/common/extension_messages.h b/extensions/common/extension_messages.h
index 9bb15abaa89535afc5ec304b2f0804e2ff4b6fd9..67d01481ab7b1eb89a6ee1799aadfcd2fee42281 100644
--- a/extensions/common/extension_messages.h
+++ b/extensions/common/extension_messages.h
@@ -359,8 +359,9 @@ IPC_MESSAGE_ROUTED1(ExtensionMsg_ExecuteCode,
 // Notification that the user scripts have been updated. It has one
 // SharedMemoryHandle argument consisting of the pickled script data. This
 // handle is valid in the context of the renderer.
-IPC_MESSAGE_CONTROL1(ExtensionMsg_UpdateUserScripts,
-                     base::SharedMemoryHandle)
+IPC_MESSAGE_CONTROL2(ExtensionMsg_UpdateUserScripts,
+                     base::SharedMemoryHandle,
+                     std::set<std::string> /* changed extensions */)
 
 // Tell the render view which browser window it's being attached to.
 IPC_MESSAGE_ROUTED1(ExtensionMsg_UpdateBrowserWindowId,
@@ -572,9 +573,18 @@ IPC_MESSAGE_ROUTED3(ExtensionHostMsg_ContentScriptsExecuting,
                     int32 /* page_id of the _topmost_ frame */,
                     GURL /* url of the _topmost_ frame */)
 
-IPC_MESSAGE_ROUTED2(ExtensionHostMsg_NotifyExtensionScriptExecution,
+// Sent from the renderer to the browser to request permission for a content
+// script to execute on a given page.
+IPC_MESSAGE_ROUTED3(ExtensionHostMsg_RequestContentScriptPermission,
                     std::string /* extension id */,
-                    int /* page id */)
+                    int /* page id */,
+                    int /* request id */)
+
+// Sent from the browser to the renderer in reply to a
+// RequestContentScriptPermission message, granting permission for a content
+// script to run.
+IPC_MESSAGE_ROUTED1(ExtensionMsg_GrantContentScriptPermission,
+                    int /* request id */)
 
 // Sent by the renderer when a web page is checking if its app is installed.
 IPC_MESSAGE_ROUTED3(ExtensionHostMsg_GetAppInstallState,