bluetooth: Add histograms and logging for getPrimaryService()

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 b72fb164eaa0fcecad8b508e5ab8699d11b606f1..57d90c7394156ffdabeecac2d804b37da1f58d0d 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -2793,6 +2793,40 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
   </summary>
 </histogram>
 
+<histogram name="Bluetooth.Web.GetPrimaryService.Outcome"
+    enum="WebBluetoothGetPrimaryServiceOutcome">
+  <owner>jyasskin@chromium.org</owner>
+  <owner>ortuno@chromium.org</owner>
+  <owner>scheib@chromium.org</owner>
+  <summary>
+    Records the result of a GATTServer.getPrimaryService() call. Used to
+    understand what errors developers are getting so we can target efforts
+    toward the most common ones.
+  </summary>
+</histogram>
+
+<histogram name="Bluetooth.Web.GetPrimaryService.Services"
+    enum="GATTServiceHash">
+  <owner>jyasskin@chromium.org</owner>
+  <owner>ortuno@chromium.org</owner>
+  <owner>scheib@chromium.org</owner>
+  <summary>
+    Records what GATT Services are used when connected. This will help us know
+    if we should build an API for specific services rather than a general
+    Bluetooth API.
+  </summary>
+</histogram>
+
+<histogram name="Bluetooth.Web.GetPrimaryService.Time" units="milliseconds">
+  <owner>jyasskin@chromium.org</owner>
+  <owner>ortuno@chromium.org</owner>
+  <owner>scheib@chromium.org</owner>
+  <summary>
+    Records how long it takes to discover all GATT services in a device. Used to
+    know if we should optimize service discovery code.
+  </summary>
+</histogram>
+
 <histogram name="Bluetooth.Web.RequestDevice.Filters.Count" units="filters">
   <owner>jyasskin@chromium.org</owner>
   <owner>ortuno@chromium.org</owner>
@@ -71754,6 +71788,12 @@ To add a new entry, add it with any value and run test to compute valid value.
   <int value="5" label="Characteristic.writeValue()"/>
 </enum>
 
+<enum name="WebBluetoothGetPrimaryServiceOutcome" type="int">
+  <int value="0" label="Success"/>
+  <int value="1" label="Device no longer in range."/>
+  <int value="2" label="No services with provided UUID."/>
+</enum>
+
 <enum name="WebBluetoothRequestDeviceOutcome" type="int">
   <int value="0" label="Success"/>
   <int value="1" label="No Bluetooth adapter"/>