Revert r70896 to move speech input back behind a flag.

chrome/browser/speech/speech_input_manager.cc

 // Copyright (c) 2010 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/speech/speech_input_manager.h"
 
 #include <map>
 #include <string>
 
 #include "app/l10n_util.h"
+#include "base/command_line.h"
 #include "base/lazy_instance.h"
 #include "base/lock.h"
 #include "base/ref_counted.h"
 #include "base/threading/thread_restrictions.h"
 #include "base/utf_string_conversions.h"
 #include "chrome/browser/browser_thread.h"
 #include "chrome/browser/platform_util.h"
 #include "chrome/browser/prefs/pref_service.h"
 #include "chrome/browser/speech/speech_input_bubble_controller.h"
 #include "chrome/browser/speech/speech_recognizer.h"
@@ skipping 124 matching lines @@
   scoped_refptr<HardwareInfo> hardware_info_;
 };
 
 static ::base::LazyInstance<SpeechInputManagerImpl> g_speech_input_manager_impl(
     base::LINKER_INITIALIZED);
 
 SpeechInputManager* SpeechInputManager::Get() {
   return g_speech_input_manager_impl.Pointer();
 }
 
+bool SpeechInputManager::IsFeatureEnabled() {
+  bool enabled = true;
+  const CommandLine& command_line = *CommandLine::ForCurrentProcess();
+
+  if (command_line.HasSwitch(switches::kDisableSpeechInput)) {
+    enabled = false;
+#if defined(GOOGLE_CHROME_BUILD)
+  } else if (!command_line.HasSwitch(switches::kEnableSpeechInput)) {
+    // We need to evaluate whether IO is OK here. http://crbug.com/63335.
+    base::ThreadRestrictions::ScopedAllowIO allow_io;
+    // Official Chrome builds have speech input enabled by default only in the
+    // dev channel.
+    std::string channel = platform_util::GetVersionStringModifier();
+    enabled = (channel == "dev");
+#endif
+  }
+
+  return enabled;
+}
+
 SpeechInputManagerImpl::SpeechInputManagerImpl()
     : recording_caller_id_(0),
       bubble_controller_(new SpeechInputBubbleController(
           ALLOW_THIS_IN_INITIALIZER_LIST(this))) {
 }
 
 SpeechInputManagerImpl::~SpeechInputManagerImpl() {
   while (requests_.begin() != requests_.end())
     CancelRecognition(requests_.begin()->first);
 }
@@ skipping 168 matching lines @@
     // to the user, abort it since user has switched focus. Otherwise
     // recognition has started and keep that going so user can start speaking to
     // another element while this gets the results in parallel.
     if (recording_caller_id_ == caller_id || !requests_[caller_id].is_active) {
       CancelRecognitionAndInformDelegate(caller_id);
     }
   }
 }
 
 }  // namespace speech_input