Add BluetoothRemoteGATTDescriptor reporting for .writeValue().

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 8cbd38d0da81034d2283504bb0e50560d8f0238b..d9ae54fb1e2d656fc417fd78a4d1df114bbbc8e1 100644
--- a/content/browser/bluetooth/bluetooth_metrics.cc
+++ b/content/browser/bluetooth/bluetooth_metrics.cc
@@ -284,7 +284,7 @@ void RecordGATTOperationOutcome(UMAGATTOperation operation,
       RecordDescriptorReadValueOutcome(outcome);
       return;
     case UMAGATTOperation::DESCRIPTOR_WRITE:
-      // TODO(683477) reporting for .writeValue()
+      RecordDescriptorWriteValueOutcome(outcome);
       return;
     case UMAGATTOperation::COUNT:
       NOTREACHED();
@@ -371,6 +371,19 @@ void RecordDescriptorReadValueOutcome(CacheQueryOutcome outcome) {
       TranslateCacheQueryOutcomeToGATTOperationOutcome(outcome));
 }
 
+// Descriptor.writeValue
+

[ortuno, 2017/01/31 19:11:51]

nit: remove unnecessary line.

+void RecordDescriptorWriteValueOutcome(UMAGATTOperationOutcome outcome) {
+  UMA_HISTOGRAM_ENUMERATION("Bluetooth.Web.Descriptor.WriteValue.Outcome",
+                            static_cast<int>(outcome),
+                            static_cast<int>(UMAGATTOperationOutcome::COUNT));
+}
+
+void RecordDescriptorWriteValueOutcome(CacheQueryOutcome outcome) {
+  RecordDescriptorWriteValueOutcome(
+      TranslateCacheQueryOutcomeToGATTOperationOutcome(outcome));
+}
+
 void RecordRSSISignalStrengthLevel(UMARSSISignalStrengthLevel level) {
   UMA_HISTOGRAM_ENUMERATION(
       "Bluetooth.Web.RequestDevice.RSSISignalStrengthLevel",