Add an about:flag for enabling a reader mode toolbar icon.

chrome/browser/android/chrome_startup_flags.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 <jni.h>
 
 #include "chrome/browser/android/chrome_startup_flags.h"
 
 #include "base/android/jni_android.h"
 #include "base/android/jni_string.h"
@@ skipping 29 matching lines @@
                             switches::kPrerenderModeSwitchValueAuto);
 
   // Enable prerender for the omnibox.
   SetCommandLineSwitchASCII(switches::kPrerenderFromOmnibox,
                             switches::kPrerenderFromOmniboxSwitchValueEnabled);
 
   // Disable syncing favicons on low end devices.
   if (base::SysInfo::IsLowEndDevice())
     SetCommandLineSwitchASCII(switches::kDisableSyncTypes, "Favicon Images");
 
-  // Enable DOM Distiller on local builds, canary and dev-channel.
-  chrome::VersionInfo::Channel channel = chrome::VersionInfo::GetChannel();
-  if (channel == chrome::VersionInfo::CHANNEL_UNKNOWN ||
-      channel == chrome::VersionInfo::CHANNEL_CANARY ||
-      channel == chrome::VersionInfo::CHANNEL_DEV) {
-    SetCommandLineSwitch(switches::kEnableDomDistiller);
-  }
+  // Enable DOM Distiller backend.
+  SetCommandLineSwitch(switches::kEnableDomDistiller);
 }