Set the Feature's ChannelForTesting to Trunk during ActiveTabTest.

chrome/common/extensions/features/feature.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/common/extensions/features/feature.h"
 
 #include <map>
 
 #include "base/command_line.h"
 #include "base/lazy_instance.h"
@@ skipping 351 matching lines @@
 // static
 void Feature::SetChannelForTesting(VersionInfo::Channel channel) {
   g_channel.Get().SetChannelForTesting(channel);
 }
 
 // static
 void Feature::ResetChannelForTesting() {
   g_channel.Get().ResetChannelForTesting();
 }
 
+// static
+chrome::VersionInfo::Channel Feature::GetCurrentChannel() {
+  if (g_channel_checking_enabled)
+    return g_channel.Get().GetChannel();
+  return chrome::VersionInfo::GetChannel();
+}
+
 }  // namespace