bluetooth: macOS: Adding histograms for NSError values

device/bluetooth/bluetooth_low_energy_device_mac.mm

Index: device/bluetooth/bluetooth_low_energy_device_mac.mm
diff --git a/device/bluetooth/bluetooth_low_energy_device_mac.mm b/device/bluetooth/bluetooth_low_energy_device_mac.mm
index 2f2cfa9bbe59f7807dd817260afe1d30af3715a5..56b50c312705c2a701720324ff05fae2018185e0 100644
--- a/device/bluetooth/bluetooth_low_energy_device_mac.mm
+++ b/device/bluetooth/bluetooth_low_energy_device_mac.mm
@@ -14,6 +14,7 @@
 #include "base/strings/string_number_conversions.h"
 #include "base/strings/sys_string_conversions.h"
 #include "device/bluetooth/bluetooth_adapter_mac.h"
+#include "device/bluetooth/bluetooth_adapter_mac_metrics.h"
 #include "device/bluetooth/bluetooth_device.h"
 #include "device/bluetooth/bluetooth_low_energy_peripheral_delegate.h"
 #include "device/bluetooth/bluetooth_remote_gatt_characteristic_mac.h"
@@ -215,6 +216,9 @@ void BluetoothLowEnergyDeviceMac::DidDiscoverPrimaryServices(NSError* error) {
     // TODO(http://crbug.com/609320): Need to pass the error.
     // TODO(http://crbug.com/609844): Decide what to do if discover failed
     // a device services.
+    LogNSErrorToHistogram(
+        error, WebBluetoothMacOSAPIs::
+                   WEB_BLUETOOTH_MACOS_APIS_DID_DISCOVER_PRIMARY_SERVICES);
     VLOG(1) << *this << ": Can't discover primary services: "
             << BluetoothAdapterMac::String(error);
     return;
@@ -258,6 +262,9 @@ void BluetoothLowEnergyDeviceMac::DidDiscoverCharacteristics(
     CBService* cb_service,
     NSError* error) {
   if (error) {
+    LogNSErrorToHistogram(
+        error, WebBluetoothMacOSAPIs::
+                   WEB_BLUETOOTH_MACOS_APIS_DID_DISCOVER_CHARACTERISTICS);
     // TODO(http://crbug.com/609320): Need to pass the error.
     // TODO(http://crbug.com/609844): Decide what to do if discover failed
     VLOG(1) << *this << ": Can't discover characteristics: "
@@ -337,6 +344,9 @@ void BluetoothLowEnergyDeviceMac::DidDiscoverDescriptors(
     CBCharacteristic* cb_characteristic,
     NSError* error) {
   if (error) {
+    LogNSErrorToHistogram(
+        error, WebBluetoothMacOSAPIs::
+                   WEB_BLUETOOTH_MACOS_APIS_DID_DISCOVER_DESCRIPTORS);
     // TODO(http://crbug.com/609320): Need to pass the error.
     // TODO(http://crbug.com/609844): Decide what to do if discover failed
     VLOG(1) << *this << ": Can't discover descriptors: "
@@ -483,6 +493,9 @@ void BluetoothLowEnergyDeviceMac::DidDisconnectPeripheral(NSError* error) {
   if (error) {
     VLOG(1) << *this
             << ": Bluetooth error: " << BluetoothAdapterMac::String(error);
+    LogNSErrorToHistogram(
+        error, WebBluetoothMacOSAPIs::
+                   WEB_BLUETOOTH_MACOS_APIS_DID_DISCONNECT_PERIPHERAL);
   }
   SetGattServicesDiscoveryComplete(false);
   // Removing all services at once to ensure that calling GetGattService on