bluetooth: Implement Service.getCharacteristics

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 bce3cf4240b395184f3558969d262fe2d373322b..3f32ccb00db8e39ffd47b2fa63bfb0cbbc375bef 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -3538,6 +3538,30 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
   </summary>
 </histogram>
 
+<histogram name="Bluetooth.Web.GetCharacteristics.Characteristic"
+    enum="GATTCharacteristicHash">
+  <owner>jyasskin@chromium.org</owner>
+  <owner>ortuno@chromium.org</owner>
+  <owner>scheib@chromium.org</owner>
+  <summary>
+    Records the UUIDs used when getting characteristics. The recorded value is a
+    31-bit hash of the UUID. Used to know what types of characteristics to
+    target when building libraries that use the Web Bluetooth API.
+  </summary>
+</histogram>
+
+<histogram name="Bluetooth.Web.GetCharacteristics.Outcome"
+    enum="WebBluetoothGetCharacteristicOutcome">
+  <owner>jyasskin@chromium.org</owner>
+  <owner>ortuno@chromium.org</owner>
+  <owner>scheib@chromium.org</owner>
+  <summary>
+    Records the outcome of a call to getCharacteristics(). Used to understand
+    what errors developers are getting so we can target efforst toward the most
+    common ones.
+  </summary>
+</histogram>
+
 <histogram name="Bluetooth.Web.GetPrimaryService.Outcome"
     enum="WebBluetoothGetPrimaryServiceOutcome">
   <owner>jyasskin@chromium.org</owner>
@@ -82502,6 +82526,7 @@ To add a new entry, add it with any value and run test to compute valid value.
   <int value="6" label="Characteristic.startNotifications()"/>
   <int value="7" label="Characteristic.stopNotifications()"/>
   <int value="8" label="RemoteGATTServer.disconnect()"/>
+  <int value="9" label="Service.getCharacteristics()"/>

[Jeffrey Yasskin, 2016/02/24 23:20:30]

Please update the label on "getCharacteristic()" too, to match.

[ortuno, 2016/02/25 23:08:27]

Done.

 </enum>
 
 <enum name="WebBluetoothGATTOperationOutcome" type="int">