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

chrome/common/chrome_switches.h

 // 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.
 
 // Defines all the command-line switches used by Chrome.
 
 #ifndef CHROME_COMMON_CHROME_SWITCHES_H_
 #define CHROME_COMMON_CHROME_SWITCHES_H_
 #pragma once
 
@@ skipping 105 matching lines @@
 extern const char kEnableIPv6[];
 extern const char kEnableLogging[];
 extern const char kEnableMemoryInfo[];
 extern const char kEnableMonitorProfile[];
 extern const char kEnableNaCl[];
 extern const char kEnableNativeWebWorkers[];
 extern const char kEnablePreparsedJsCaching[];
 extern const char kEnablePreconnect[];
 extern const char kEnablePrintPreview[];
 extern const char kEnableSearchProviderApiV2[];
+extern const char kEnableSpeechInput[];
 extern const char kEnableStatsTable[];
 extern const char kEnableSync[];
 extern const char kEnableSyncAutofill[];
 extern const char kEnableSyncBookmarks[];
 extern const char kEnableSyncExtensions[];
 extern const char kEnableSyncPasswords[];
 extern const char kEnableSyncPreferences[];
 extern const char kEnableSyncThemes[];
 extern const char kEnableSyncTypedUrls[];
 extern const char kEnableTabbedOptions[];
@@ skipping 211 matching lines @@
 #endif
 // Return true if the switches indicate the seccomp sandbox is enabled.
 bool SeccompSandboxEnabled();
 
 // DON'T ADD RANDOM STUFF HERE. Put it in the main section above in
 // alphabetical order, or in one of the ifdefs (also in order in each section).
 
 }  // namespace switches
 
 #endif  // CHROME_COMMON_CHROME_SWITCHES_H_