bluetooth: android: Implement & test CreateGattConnection.

device/bluetooth/bluetooth_device_android.h

Index: device/bluetooth/bluetooth_device_android.h
diff --git a/device/bluetooth/bluetooth_device_android.h b/device/bluetooth/bluetooth_device_android.h
index e9e4a6bb7d8864b869d87a3e10f748a84329378b..627df052b4092d5cf3517d20b2d3af69a895c788 100644
--- a/device/bluetooth/bluetooth_device_android.h
+++ b/device/bluetooth/bluetooth_device_android.h
@@ -36,6 +36,9 @@ class DEVICE_BLUETOOTH_EXPORT BluetoothDeviceAndroid final
   // Register C++ methods exposed to Java using JNI.
   static bool RegisterJNI(JNIEnv* env);
 
+  // Returns the associated ChromeBluetoothDevice Java object.
+  base::android::ScopedJavaLocalRef<jobject> GetJavaObject();
+
   // Updates cached copy of advertised UUIDs discovered during a scan.
   // Returns true if new UUIDs differed from cached values.
   bool UpdateAdvertisedUUIDs(
@@ -80,6 +83,13 @@ class DEVICE_BLUETOOTH_EXPORT BluetoothDeviceAndroid final
       const ConnectToServiceCallback& callback,
       const ConnectToServiceErrorCallback& error_callback) override;
 
+  // Callback indicating when GATT client has connected/disconnected.
+  // See android.bluetooth.BluetoothGattCallback.onConnectionStateChange.
+  void OnConnectionStateChange(JNIEnv* env,
+                               jobject jcaller,
+                               int32_t status,
+                               bool connected);
+
  protected:
   BluetoothDeviceAndroid(BluetoothAdapterAndroid* adapter);