mac: Add metrics to record Bluetooth availability and capabilities.

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 410c095b06078d1a989a32551f2ef0901e476ee9..1483040a34d61346d87669c4c38bee096aef27d2 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -18923,6 +18923,14 @@ Therefore, the affected-histogram name has to have at least one dot in it.
   <summary>The number of clicks on the origin chip.</summary>
 </histogram>
 
+<histogram name="OSX.BluetoothAvailability" enum="BluetoothAvailability">
+  <owner>erikchen@chromium.org</owner>
+  <summary>
+    The availability and capabilities of the Bluetooth driver on OSX devices.
+    This metric is logged on startup.
+  </summary>
+</histogram>
+
 <histogram name="OSX.CatSixtyFour" enum="CatSixtyFour">
   <owner>mark@chromium.org</owner>
   <summary>The cat's flavor and how many bits there are in it.</summary>
@@ -35472,6 +35480,14 @@ Therefore, the affected-histogram name has to have at least one dot in it.
   <int value="5" label="Blacklist disabled."/>
 </enum>
 
+<enum name="BluetoothAvailability" type="int">
+  <int value="0" label="Unexpected error"/>
+  <int value="1" label="Not available"/>
+  <int value="2" label="Available without LE"/>
+  <int value="3" label="Available with LE"/>
+  <int value="4" label="Available unknown LE"/>
+</enum>
+
 <enum name="BluetoothPairingMethod" type="int">
   <int value="0" label="No user interaction required"/>
   <int value="1" label="PIN Code requested from user"/>