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

chrome/browser/profiles/profile_impl.cc

Index: chrome/browser/profiles/profile_impl.cc
diff --git a/chrome/browser/profiles/profile_impl.cc b/chrome/browser/profiles/profile_impl.cc
index aa2a646f0edd83d3516cd9d68771ac25bcd5307b..7186f3907b2a13fe30b4e32c9075755e40327224 100644
--- a/chrome/browser/profiles/profile_impl.cc
+++ b/chrome/browser/profiles/profile_impl.cc
@@ -909,11 +909,19 @@ net::URLRequestContextGetter* ProfileImpl::GetRequestContextForIsolatedApp(
 
 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(