Add BluetoothRemoteGATTDescriptor reporting for .readValue().

content/browser/bluetooth/bluetooth_metrics.cc

Index: content/browser/bluetooth/bluetooth_metrics.cc
diff --git a/content/browser/bluetooth/bluetooth_metrics.cc b/content/browser/bluetooth/bluetooth_metrics.cc
index d33f130d0eca3f877c96cf3ae6d7b25856b94fc6..84421ee5778053c7f19c64baa74b14f077ea4a82 100644
--- a/content/browser/bluetooth/bluetooth_metrics.cc
+++ b/content/browser/bluetooth/bluetooth_metrics.cc
@@ -281,7 +281,7 @@ void RecordGATTOperationOutcome(UMAGATTOperation operation,
       RecordStartNotificationsOutcome(outcome);
       return;
     case UMAGATTOperation::DESCRIPTOR_READ:
-      // TODO(667319) Add reporting to descriptors
+      RecordDescriptorReadValueOutcome(outcome);
       return;
     case UMAGATTOperation::COUNT:
       NOTREACHED();
@@ -313,7 +313,6 @@ static UMAGATTOperationOutcome TranslateCacheQueryOutcomeToGATTOperationOutcome(
 
 // Characteristic.readValue
 
-// static
 void RecordCharacteristicReadValueOutcome(UMAGATTOperationOutcome outcome) {
   UMA_HISTOGRAM_ENUMERATION("Bluetooth.Web.Characteristic.ReadValue.Outcome",
                             static_cast<int>(outcome),
@@ -356,6 +355,19 @@ void RecordRSSISignalStrength(int rssi) {
                               rssi);
 }
 
+// Descriptor.readValue
+
+void RecordDescriptorReadValueOutcome(UMAGATTOperationOutcome outcome) {
+  UMA_HISTOGRAM_ENUMERATION("Bluetooth.Web.Descriptor.ReadValue.Outcome",
+                            static_cast<int>(outcome),
+                            static_cast<int>(UMAGATTOperationOutcome::COUNT));
+}
+
+void RecordDescriptorReadValueOutcome(CacheQueryOutcome outcome) {
+  RecordDescriptorReadValueOutcome(
+      TranslateCacheQueryOutcomeToGATTOperationOutcome(outcome));
+}
+
 void RecordRSSISignalStrengthLevel(UMARSSISignalStrengthLevel level) {
   UMA_HISTOGRAM_ENUMERATION(
       "Bluetooth.Web.RequestDevice.RSSISignalStrengthLevel",