Report Bluetooth adapter status to UMA.

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 c681c594f1cfa81a87ba5c27743cb80b21b6aa27..405889428c246190afc056ea4b56650d670afe42 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -6648,6 +6648,18 @@ Therefore, the affected-histogram name has to have at least one dot in it.
   </details>
 </histogram>
 
+<histogram name="EasyUnlock.BluetoothAvailability"
+    enum="EasyUnlockBluetoothType">
+  <owner>bcwhite@chromium.org</owner>
+  <summary>
+    Reports the type of Bluetooth adapter present in the device.
+  </summary>
+  <details>
+    Statistics about what Bluetooth capabilities are available will determine
+    how the EasyUnlock feature gets developed and deployed across platforms.
+  </details>
+</histogram>
+
 <histogram name="EasyUnlock.ClickedButton" enum="EasyUnlockButton">
   <owner>joshwoodward@google.com</owner>
   <owner>tbarzic@chromium.org</owner>
@@ -47177,6 +47189,12 @@ Therefore, the affected-histogram name has to have at least one dot in it.
   <int value="19" label="Password entry: Phone locked and tx power too high"/>
 </enum>
 
+<enum name="EasyUnlockBluetoothType" type="int">
+  <int value="0" label="No adapter"/>
+  <int value="1" label="Normal"/>
+  <int value="2" label="Low energy"/>
+</enum>
+
 <enum name="EasyUnlockButton" type="int">
   <int value="0" label="Setup app launches"/>
   <int value="1" label="Find device"/>