Instant: Use only one hidden WebContents per profile.

chrome/browser/chrome_content_browser_client.cc

 // Copyright (c) 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>
 
@@ skipping 1091 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(profile))
+          command_line->AppendSwitch(switches::kEnableInstantExtendedAPI);
+      }
     }
 
     if (content::IsThreadedCompositingEnabled())
       command_line->AppendSwitch(switches::kEnableThreadedCompositing);
 
     // Please keep this in alphabetical order.
     static const char* const kSwitchNames[] = {
       switches::kAllowHTTPBackgroundPage,
       switches::kAllowLegacyExtensionManifests,
       switches::kAllowScriptingGallery,
@@ skipping 971 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