Allow whitelisted content scripts to be injected in WebViews.

extensions/browser/user_script_loader.cc

 // 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.
 
 #include "extensions/browser/user_script_loader.h"
 
 #include <set>
 #include <string>
 
 #include "base/version.h"
@@ skipping 360 matching lines @@
   content::NotificationService::current()->Notify(
       extensions::NOTIFICATION_USER_SCRIPTS_UPDATED,
       content::Source<BrowserContext>(browser_context_),
       content::Details<base::SharedMemory>(shared_memory_.get()));
   FOR_EACH_OBSERVER(Observer, observers_, OnScriptsLoaded(this));
 }
 
 void UserScriptLoader::SendUpdate(content::RenderProcessHost* process,
                                   base::SharedMemory* shared_memory,
                                   const std::set<HostID>& changed_hosts) {
-  // Don't allow injection of extensions' content scripts into <webview>.
-  if (process->IsIsolatedGuest() && host_id().id().empty())
-    return;
+  // Don't allow injection of non-whitelisted extensions' content scripts
+  // into <webview>.
+  bool whitelisted_only = process->IsIsolatedGuest() && host_id().id().empty();
 
   // Make sure we only send user scripts to processes in our browser_context.
   if (!ExtensionsBrowserClient::Get()->IsSameContext(
           browser_context_, process->GetBrowserContext()))
     return;
 
   // If the process is being started asynchronously, early return.  We'll end up
   // calling InitUserScripts when it's created which will call this again.
   base::ProcessHandle handle = process->GetHandle();
   if (!handle)
     return;
 
   base::SharedMemoryHandle handle_for_process;
   if (!shared_memory->ShareToProcess(handle, &handle_for_process))
     return;  // This can legitimately fail if the renderer asserts at startup.
 
   if (base::SharedMemory::IsHandleValid(handle_for_process)) {
     process->Send(new ExtensionMsg_UpdateUserScripts(handle_for_process,
-                                                     host_id(), changed_hosts));
+                                                     host_id(),
+                                                     changed_hosts,
+                                                     whitelisted_only));
   }
 }
 
 }  // namespace extensions