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

chrome/common/chrome_switches.cc

Index: chrome/common/chrome_switches.cc
diff --git a/chrome/common/chrome_switches.cc b/chrome/common/chrome_switches.cc
index 6016cdab7071b17c890087f6a1bb1f31ca733709..d8bcddf72a251246cfe3da13cd5c4df2ba3ed690 100644
--- a/chrome/common/chrome_switches.cc
+++ b/chrome/common/chrome_switches.cc
@@ -379,6 +379,9 @@ const char kEnablePrintPreview[]            = "enable-print-preview";
 // parameter to indicate if the provider should be the default.
 const char kEnableSearchProviderApiV2[]     = "enable-search-provider-api-v2";
 
+// Enables speech input.
+const char kEnableSpeechInput[]             = "enable-speech-input";
+
 // Enables StatsTable, logging statistics to a global named shared memory table.
 const char kEnableStatsTable[]              = "enable-stats-table";