Handle extension webrequest API on the IO thread. This speeds up blocking event

chrome/browser/profiles/profile_impl.cc

 // Copyright (c) 2011 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 "chrome/browser/profiles/profile_impl.h"
 
 #include "base/command_line.h"
 #include "base/compiler_specific.h"
 #include "base/environment.h"
 #include "base/file_path.h"
@@ skipping 891 matching lines @@
   return io_data_.GetExtensionsRequestContextGetter();
 }
 
 net::URLRequestContextGetter* ProfileImpl::GetRequestContextForIsolatedApp(
     const std::string& app_id) {
   return io_data_.GetIsolatedAppRequestContextGetter(app_id);
 }
 
 void ProfileImpl::RegisterExtensionWithRequestContexts(
     const Extension* extension) {
+  base::Time install_time;
+  if (extension->location() != Extension::COMPONENT) {

[Mihai Parparita -not on Chrome, 2011/06/08 01:11:59]

Is this check really necessary? ExtensionPrefs::GetInstallTime makes it sound
like it'll return the default time if the actual install time can't be
determined.

[Matt Perry, 2011/06/08 20:47:00]

GetInstallTime asserts that the ExtensionPref exists, which is not the case for
component extensions. I was wary of removing that assert since the function was
probably not meant to be used with component extensions.

[battre, 2011/06/08 22:26:05]

I have introduced GetInstallTime to get a deterministic order for extensions.

The "if (!extension) { NOTREACHED(); ... }" in GetInstallTime was introduced to
be sure that the installation order is actually deterministic and that we do not
accidentally call the function without noticing that the return values are
non-deterministic.

+    install_time = GetExtensionService()->extension_prefs()->
+        GetInstallTime(extension->id());
+  }
+  bool incognito_enabled =
+      GetExtensionService()->IsIncognitoEnabled(extension->id());
   BrowserThread::PostTask(
       BrowserThread::IO, FROM_HERE,
       NewRunnableMethod(extension_info_map_.get(),
                         &ExtensionInfoMap::AddExtension,
-                        make_scoped_refptr(extension)));
+                        make_scoped_refptr(extension),
+                        install_time, incognito_enabled));
 }
 
 void ProfileImpl::UnregisterExtensionWithRequestContexts(
     const std::string& extension_id,
     const UnloadedExtensionInfo::Reason reason) {
   BrowserThread::PostTask(
       BrowserThread::IO, FROM_HERE,
       NewRunnableMethod(extension_info_map_.get(),
                         &ExtensionInfoMap::RemoveExtension,
                         extension_id,
@@ skipping 700 matching lines @@
   if (!prerender::PrerenderManager::IsPrerenderingPossible())
     return NULL;
   if (!prerender_manager_.get()) {
     CHECK(g_browser_process->prerender_tracker());
     prerender_manager_.reset(
         new prerender::PrerenderManager(
             this, g_browser_process->prerender_tracker()));
   }
   return prerender_manager_.get();
 }