Refactoring: de-couple Extensions from "script injection System" [render side]:2

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/bind.h"
@@ skipping 426 matching lines @@
     // though it removes the possibility that freeing the shared memory block
     // would open up enough FDs for long enough for a retry to succeed.
 
     // Pretend the extension change didn't happen.
     return;
   }
 
   // We've got scripts ready to go.
   shared_memory_.reset(shared_memory.release());
 
-  for (content::RenderProcessHost::iterator i(
-           content::RenderProcessHost::AllHostsIterator());
-       !i.IsAtEnd();
-       i.Advance()) {
-    SendUpdate(i.GetCurrentValue(), shared_memory_.get(), changed_hosts_);
+  // If user scripts are comming from a <webview>, will only notify the

[Nico, 2015/03/05 00:40:11]

nit: "coming"

+  // RenderProcessHost of that <webview>; otherwise will notify all of the
+  // RenderProcessHosts.
+  if (user_scripts && !user_scripts->empty() &&
+      (*user_scripts)[0].consumer_instance_type() ==
+          UserScript::ConsumerInstanceType::WEBVIEW) {
+    DCHECK_EQ(1u, user_scripts->size());
+    int render_process_id = (*user_scripts)[0].routing_info().render_process_id;
+    content::RenderProcessHost* host =
+        content::RenderProcessHost::FromID(render_process_id);
+    if (host)
+      SendUpdate(host, shared_memory_.get(), changed_hosts_);
+  } else {
+    for (content::RenderProcessHost::iterator i(
+            content::RenderProcessHost::AllHostsIterator());
+        !i.IsAtEnd(); i.Advance()) {
+      SendUpdate(i.GetCurrentValue(), shared_memory_.get(), changed_hosts_);
+    }
   }
   changed_hosts_.clear();
 
   content::NotificationService::current()->Notify(
       extensions::NOTIFICATION_USER_SCRIPTS_UPDATED,
       content::Source<BrowserContext>(browser_context_),
       content::Details<base::SharedMemory>(shared_memory_.get()));
 }
 
 void UserScriptLoader::SendUpdate(content::RenderProcessHost* process,
@@ skipping 24 matching lines @@
   for (const HostID& id : changed_hosts)
     changed_ids_set.insert(id.id());
 
   if (base::SharedMemory::IsHandleValid(handle_for_process)) {
     process->Send(new ExtensionMsg_UpdateUserScripts(
         handle_for_process, host_id().id(), changed_ids_set));
   }
 }
 
 }  // namespace extensions