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 4c455cd3bc8fe73f4eaf9fcbc9d489a2644d3bb0..8757ff643584ac7b84c078e72f5230782e50cb78 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -18487,6 +18487,13 @@ 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.
+  </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>
@@ -33710,6 +33717,12 @@ 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="Bluetooth not available."/>
+  <int value="1" label="Bluetooth available without LE."/>
+  <int value="2" label="Bluetooth available with LE."/>
+</enum>
+
 <enum name="BluetoothPairingMethod" type="int">
   <int value="0" label="No user interaction required"/>
   <int value="1" label="PIN Code requested from user"/>