Add --enable-speech-input switch and set ENABLE_INPUT_SPEECH=1

chrome/browser/renderer_host/browser_render_process_host.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.
 
 // Represents the browser side of the browser <--> renderer communication
 // channel. There will be one RenderProcessHost per renderer process.
 
 #include "chrome/browser/renderer_host/browser_render_process_host.h"
 
 #include <algorithm>
@@ skipping 530 matching lines @@
     switches::kDisableByteRangeSupport,
     switches::kDisableDatabases,
     switches::kDisableDesktopNotifications,
     switches::kDisableWebSockets,
     switches::kDisableLocalStorage,
     switches::kDisableSessionStorage,
     switches::kDisableSharedWorkers,
     switches::kDisableApplicationCache,
     switches::kEnableDeviceOrientation,
     switches::kEnableIndexedDatabase,
+    switches::kEnableSpeechInput,
     switches::kDisableGeolocation,
     switches::kShowPaintRects,
     switches::kEnableOpenMax,
     switches::kVideoThreads,
     switches::kEnableVideoFullscreen,
     switches::kEnableVideoLayering,
     switches::kEnableVideoLogging,
     switches::kEnableTouch,
     // We propagate the Chrome Frame command line here as well in case the
     // renderer is not run in the sandbox.
@@ skipping 503 matching lines @@
         IPC::InvalidPlatformFileForTransit(),
         std::vector<std::string>(),
         std::string(),
         false));
   }
 }
 
 void BrowserRenderProcessHost::EnableAutoSpellCorrect(bool enable) {
   Send(new ViewMsg_SpellChecker_EnableAutoSpellCorrect(enable));
 }