Add UMA for WebBluetooth RSSI signal strength level

content/browser/bluetooth/bluetooth_metrics.h

Index: content/browser/bluetooth/bluetooth_metrics.h
diff --git a/content/browser/bluetooth/bluetooth_metrics.h b/content/browser/bluetooth/bluetooth_metrics.h
index d3506c3dad2071f0cfa3a8e4cb727d7757731089..a6f8f7d920a177aa0837b471e03bd01216d9898d 100644
--- a/content/browser/bluetooth/bluetooth_metrics.h
+++ b/content/browser/bluetooth/bluetooth_metrics.h
@@ -276,6 +276,24 @@ void RecordStartNotificationsOutcome(UMAGATTOperationOutcome outcome);
 // called if QueryCacheForCharacteristic fails.
 void RecordStartNotificationsOutcome(CacheQueryOutcome outcome);
 
+enum class UMARSSISignalStrengthLevel {
+  LESS_THAN_OR_EQUAL_TO_MIN_RSSI,
+  LEVEL_0,
+  LEVEL_1,
+  LEVEL_2,
+  LEVEL_3,
+  LEVEL_4,
+  GREATER_THAN_OR_EQUAL_TO_MAX_RSSI,
+  // Note: Add new RSSI signal strength level immediately above this line.
+  COUNT
+};
+
+// Records the RSSI signal strength and level when

[scheib, 2016/10/31 22:22:32]

"Records the raw RSSI, and processed result displayed to users, when"

[juncai, 2016/10/31 23:29:50]

Done.

+// content::BluetoothDeviceChooserController::CalculateSignalStrengthLevel() is
+// called.
+void RecordRSSISignalStrength(int rssi);
+void RecordRSSISignalStrengthLevel(UMARSSISignalStrengthLevel level);
+
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_BLUETOOTH_BLUETOOTH_METRICS_H_