Instant: Use only one hidden WebContents per profile.

chrome/browser/chrome_content_browser_client.cc

-// Copyright (c) 2012 The Chromium Authors. All rights reserved.
+// Copyright 2012 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/chrome_content_browser_client.h"
 
 #include <set>
 #include <utility>
 #include <vector>
 
 #include "base/bind.h"
@@ skipping 1111 matching lines @@
         command_line->AppendSwitch(
             switches::kDisableClientSidePhishingDetection);
       }
 
       if (!prefs->GetBoolean(prefs::kPrintPreviewDisabled))
         command_line->AppendSwitch(switches::kRendererPrintPreview);
 
       InstantService* instant_service =
           InstantServiceFactory::GetForProfile(profile);
       if (instant_service &&
-          instant_service->IsInstantProcess(process->GetID()))
+          instant_service->IsInstantProcess(process->GetID())) {
         command_line->AppendSwitch(switches::kInstantProcess);
+        if (chrome::search::IsInstantExtendedAPIEnabled())
+          command_line->AppendSwitch(switches::kEnableInstantExtendedAPI);
+      }
 
       SigninManager* signin_manager =
           SigninManagerFactory::GetForProfile(profile);
       if (signin_manager && signin_manager->IsSigninProcess(process->GetID()))
         command_line->AppendSwitch(switches::kSigninProcess);
     }
 
     if (content::IsThreadedCompositingEnabled())
       command_line->AppendSwitch(switches::kEnableThreadedCompositing);
 
@@ skipping 976 matching lines @@
     io_thread_application_locale_ = locale;
 }
 
 void ChromeContentBrowserClient::SetApplicationLocaleOnIOThread(
     const std::string& locale) {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
   io_thread_application_locale_ = locale;
 }
 
 }  // namespace chrome