Fix bug when unplugging an audio input device whilst using speech input.

media/audio/audio_input_controller.h

Index: media/audio/audio_input_controller.h
diff --git a/media/audio/audio_input_controller.h b/media/audio/audio_input_controller.h
index b21eabadaf2fce91bdfbb5f02a32b54b9a3c4a4a..b8789e0747b68df5375d930ef149160f2fb4ddd2 100644
--- a/media/audio/audio_input_controller.h
+++ b/media/audio/audio_input_controller.h
@@ -9,6 +9,7 @@
 #include "base/memory/scoped_ptr.h"
 #include "base/synchronization/lock.h"
 #include "base/threading/thread.h"
+#include "base/timer.h"
 #include "media/audio/audio_io.h"
 #include "media/audio/audio_manager.h"
 
@@ -100,6 +101,7 @@ class AudioInputController
   // AudioInputController being created directly.
 #if defined(UNIT_TEST)
   static void set_factory(Factory* factory) { factory_ = factory; }
+  AudioInputStream* stream() { return stream_; }
 #endif
 
   // Starts recording in this audio input stream.
@@ -138,10 +140,18 @@ class AudioInputController
   void DoRecord();
   void DoClose();
   void DoReportError(int code);
+  void DoReportNoDataError();
+  void DoResetNoDataTimer();
 
   EventHandler* handler_;
   AudioInputStream* stream_;
 
+  // |no_data_timer_| is used to call DoReportNoDataError when we stop
+  // receiving OnData calls without an OnClose call. This can occur when an
+  // audio input device is unplugged whilst recording on Windows.
+  // See http://crbug.com/79936 for details.
+  base::DelayTimer<AudioInputController> no_data_timer_;
+
   // |state_| is written on the audio input controller thread and is read on
   // the hardware audio thread. These operations need to be locked. But lock
   // is not required for reading on the audio input controller thread.