Revert CL 117933003. Re-add resource speculative prefetching code.

chrome/browser/ui/tab_helpers.cc

Index: chrome/browser/ui/tab_helpers.cc
diff --git a/chrome/browser/ui/tab_helpers.cc b/chrome/browser/ui/tab_helpers.cc
index 797bb3af6cc18848227beabf3ff625276421d288..63197670e15eaf4f917c3d36e0158d8bb73b06c8 100644
--- a/chrome/browser/ui/tab_helpers.cc
+++ b/chrome/browser/ui/tab_helpers.cc
@@ -12,7 +12,10 @@
 #include "chrome/browser/infobars/infobar_service.h"
 #include "chrome/browser/net/net_error_tab_helper.h"
 #include "chrome/browser/password_manager/chrome_password_manager_client.h"
+#include "chrome/browser/predictors/resource_prefetch_predictor_factory.h"
+#include "chrome/browser/predictors/resource_prefetch_predictor_tab_helper.h"
 #include "chrome/browser/prerender/prerender_tab_helper.h"
+#include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/sessions/session_tab_helper.h"
 #include "chrome/browser/tab_contents/navigation_metrics_recorder.h"
 #include "chrome/browser/translate/chrome_translate_client.h"
@@ -34,6 +37,7 @@
 
 #if defined(OS_ANDROID)
 #include "chrome/browser/android/webapps/single_tab_mode_tab_helper.h"
+#include "chrome/browser/profiles/profile_android.h"

[Lei Zhang, 2014/09/09 03:32:20]

nit: not used at all?

[Zhen Wang, 2014/09/13 00:36:33]

removed

 #include "chrome/browser/ui/android/context_menu_helper.h"
 #include "chrome/browser/ui/android/window_android_helper.h"
 #else
@@ -111,6 +115,9 @@ void TabHelpers::AttachTabHelpers(WebContents* web_contents) {
   extensions::SetViewType(web_contents, extensions::VIEW_TYPE_TAB_CONTENTS);
 #endif
 
+  Profile* profile = Profile::FromBrowserContext(

[Lei Zhang, 2014/09/09 03:32:20]

nit: You don't need this, ResourcePrefetchPredictorFactory::GetForProfile()
takes a BrowserContext. Remove the chrome/browser/profiles/profile.h #include as
well.

[Zhen Wang, 2014/09/13 00:36:33]

Done.

+      web_contents->GetBrowserContext());
+
   // Create all the tab helpers.
 
   // SessionTabHelper comes first because it sets up the tab ID, and other
@@ -227,4 +234,9 @@ void TabHelpers::AttachTabHelpers(WebContents* web_contents) {
         ChromePasswordManagerClient::GetManagerFromWebContents(web_contents));
   }
 #endif
+
+  if (predictors::ResourcePrefetchPredictorFactory::GetForProfile(profile)) {
+    predictors::ResourcePrefetchPredictorTabHelper::CreateForWebContents(
+        web_contents);
+  }
 }