Refactor AudioInputController and split stat by stream type.

tools/metrics/histograms/histograms.xml

Index: tools/metrics/histograms/histograms.xml
diff --git a/tools/metrics/histograms/histograms.xml b/tools/metrics/histograms/histograms.xml
index 05ece5a71fcc4cdcf1b6adbab524412d063cc8d9..e3dce95832029fee2ca591842f1bb78802774d1d 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -24189,14 +24189,6 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
   <summary>Records the autoplay source of audios.</summary>
 </histogram>
 
-<histogram name="Media.Audio.Capture.CallbackError" enum="BooleanError">
-  <owner>tommi@chromium.org</owner>
-  <summary>
-    A boolean that reflects whether or not an error was reported during audio
-    capture.
-  </summary>
-</histogram>
-
 <histogram name="Media.Audio.Capture.FramesProvided" units="frames">
   <owner>grunell@chromium.org</owner>
   <summary>
@@ -24223,6 +24215,15 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
   </summary>
 </histogram>
 
+<histogram name="Media.Audio.Capture.HighLatencyCallbackError"
+    enum="BooleanError">
+  <owner>tommi@chromium.org</owner>
+  <summary>
+    A boolean that reflects whether or not an error was reported during audio
+    capture for a high latency stream.
+  </summary>
+</histogram>
+
 <histogram name="Media.Audio.Capture.LargestGlitchMs" units="ms">
   <owner>grunell@chromium.org</owner>
   <summary>
@@ -24242,6 +24243,23 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
   </summary>
 </histogram>
 
+<histogram name="Media.Audio.Capture.LowLatencyCallbackError"
+    enum="BooleanError">
+  <owner>tommi@chromium.org</owner>
+  <summary>
+    A boolean that reflects whether or not an error was reported during audio
+    capture for a low latency stream.
+  </summary>
+</histogram>
+
+<histogram name="Media.Audio.Capture.VirtualCallbackError" enum="BooleanError">
+  <owner>tommi@chromium.org</owner>
+  <summary>
+    A boolean that reflects whether or not an error was reported during audio
+    capture for a virtual stream.
+  </summary>
+</histogram>
+
 <histogram name="Media.Audio.InputBufferSizeWasChangedAudioWorkedMac"
     enum="BooleanChanged">
   <owner>henrika@chromium.org</owner>
@@ -25438,6 +25456,15 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
   </summary>
 </histogram>
 
+<histogram name="Media.HighLatencyAudioCaptureStartupSuccess"
+    enum="CaptureStartupResult2">
+  <owner>maxmorin@chromium.org</owner>
+  <summary>
+    Whether capture started successfully after a high-latency input stream
+    startup was requested.
+  </summary>
+</histogram>
+
 <histogram name="Media.InfoLoadDelay" units="ms">
   <owner>qinmin@chromium.org</owner>
   <summary>
@@ -25511,6 +25538,15 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
   </summary>
 </histogram>
 
+<histogram name="Media.LowLatencyAudioCaptureStartupSuccess"
+    enum="CaptureStartupResult2">
+  <owner>maxmorin@chromium.org</owner>
+  <summary>
+    Whether capture started successfully after a low-latency input stream
+    startup was requested.
+  </summary>
+</histogram>
+
 <histogram name="Media.MicrophoneMuted" enum="MicrophoneMuteResult">
   <owner>henrika@chromium.org</owner>
   <summary>
@@ -26485,6 +26521,15 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
   <summary>Visible width of HTML5 video.</summary>
 </histogram>
 
+<histogram name="Media.VirtualAudioCaptureStartupSuccess"
+    enum="CaptureStartupResult2">
+  <owner>maxmorin@chromium.org</owner>
+  <summary>
+    Whether capture started successfully after a high-latency input stream
+    startup was requested.
+  </summary>
+</histogram>
+
 <histogram name="Media.Vpx.VideoDecoderBuffersInUseByDecoder">
   <obsolete>
     Deprecated 05/2016.
@@ -80335,6 +80380,9 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
 </enum>
 
 <enum name="CaptureStartupResult" type="int">
+  <obsolete>
+    Deprecated as of 01/2017.
+  </obsolete>
   <int value="0" label="No data callback"/>
   <int value="1" label="OK"/>
   <int value="2" label="Failed to create high latency stream"/>
@@ -80345,6 +80393,14 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
   <int value="7" label="Failed to open low latency stream"/>
 </enum>
 
+<enum name="CaptureStartupResult2" type="int">
+  <int value="0" label="OK"/>
+  <int value="1" label="Failed to create high latency stream"/>
+  <int value="2" label="Failed to open high latency stream"/>
+  <int value="3" label="Never received any data"/>
+  <int value="4" label="No data received and capture stopped within 500ms"/>
+</enum>
+
 <enum name="CastCertificateStatus" type="int">
   <int value="0" label="OK"/>
   <int value="1" label="InvalidCrl"/>