Only enable speech dispatcher on Linux with an explicit switch.

chrome/browser/speech/tts_linux.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 <math.h>
 
 #include <map>
 
+#include "base/command_line.h"
 #include "base/debug/leak_annotations.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/memory/singleton.h"
 #include "base/synchronization/lock.h"
 #include "chrome/browser/speech/tts_platform.h"
+#include "chrome/common/chrome_switches.h"
 #include "content/public/browser/browser_thread.h"
 
 #include "library_loaders/libspeechd.h"
 
 using content::BrowserThread;
 
 namespace {
 
 const char kNotSupportedError[] =
     "Native speech synthesis not supported on this platform.";
@@ skipping 62 matching lines @@
 
   DISALLOW_COPY_AND_ASSIGN(TtsPlatformImplLinux);
 };
 
 // static
 SPDNotificationType TtsPlatformImplLinux::current_notification_ =
     SPD_EVENT_END;
 
 TtsPlatformImplLinux::TtsPlatformImplLinux()
     : utterance_id_(0) {
+  const CommandLine& command_line = *CommandLine::ForCurrentProcess();
+  if (!command_line.HasSwitch(switches::kEnableSpeechDispatcher))
+    return;
+
   BrowserThread::PostTask(BrowserThread::FILE,
                           FROM_HERE,
                           base::Bind(&TtsPlatformImplLinux::Initialize,
                                      base::Unretained(this)));
 }
 
 void TtsPlatformImplLinux::Initialize() {
   base::AutoLock lock(initialization_lock_);
 
   if (!libspeechd_loader_.Load("libspeechd.so.2"))
@@ skipping 231 matching lines @@
 // static
 TtsPlatformImplLinux* TtsPlatformImplLinux::GetInstance() {
   return Singleton<TtsPlatformImplLinux,
                    LeakySingletonTraits<TtsPlatformImplLinux> >::get();
 }
 
 // static
 TtsPlatformImpl* TtsPlatformImpl::GetInstance() {
   return TtsPlatformImplLinux::GetInstance();
 }