Activate data reduction proxy after profile initialization is complete.

chrome/browser/profiles/profile_manager.cc

Index: chrome/browser/profiles/profile_manager.cc
diff --git a/chrome/browser/profiles/profile_manager.cc b/chrome/browser/profiles/profile_manager.cc
index 21df767c82daec0f7ffc68e9ed40f99aabd73297..0ce15038b77936e905c45f20a7992e806a791379 100644
--- a/chrome/browser/profiles/profile_manager.cc
+++ b/chrome/browser/profiles/profile_manager.cc
@@ -25,6 +25,8 @@
 #include "chrome/browser/content_settings/host_content_settings_map.h"
 #include "chrome/browser/download/download_service.h"
 #include "chrome/browser/download/download_service_factory.h"
+#include "chrome/browser/net/spdyproxy/data_reduction_proxy_chrome_settings.h"
+#include "chrome/browser/net/spdyproxy/data_reduction_proxy_chrome_settings_factory.h"
 #include "chrome/browser/password_manager/password_store_factory.h"
 #include "chrome/browser/prefs/incognito_mode_prefs.h"
 #include "chrome/browser/profiles/bookmark_model_loaded_observer.h"
@@ -1010,6 +1012,11 @@ void ProfileManager::DoFinalInitForServices(Profile* profile,
   StartupTaskRunnerServiceFactory::GetForProfile(profile)->
       StartDeferredTaskRunners();
 
+  // Activate data reduction proxy. This creates a request context and makes a
+  // URL request to check if the data reduction proxy server is reachable.
+  DataReductionProxyChromeSettingsFactory::GetForBrowserContext(profile)->

[rpetterson, 2014/10/23 19:57:04]

Is there any risk of this call slowing down startup since we create at least 1
profile pretty much immediately upon startup?

[Not at Google. Contact bengr, 2014/10/23 20:08:50]

This call is simply being moved from profile_impl.cc::DoFinalInit (which calls
InitDataReductionProxySettings which used to call
MaybeActivateDataReductionProxy) to here. So the code being executed does not
change, just its order.

Here is everything this call does:
1) Instantiate an instance of DataReductionProxyParams and
DataReductionProxyChromeSettings which should be quick.
2) Set a pref and proxy configs.
3) Make a URL request. This is asynchronous.
So I don't see any potential slowdown.

+      MaybeActivateDataReductionProxy(true);
+
   AccountTrackerServiceFactory::GetForProfile(profile);
   AccountReconcilorFactory::GetForProfile(profile);
 }