Camera: Add video stabilization mode to camera session stats

Store the videoStabilization key value in the last request of the session.

Test: ./out/host/linux-x86/bin/statsd_testdrive 227
Bug: 224639088
Change-Id: I9f5dcc7d2eaa045e7243774df150e46b29aa491f
diff --git a/services/camera/libcameraservice/api2/CameraDeviceClient.h b/services/camera/libcameraservice/api2/CameraDeviceClient.h
index 3af0b80..c5aad6b 100644
--- a/services/camera/libcameraservice/api2/CameraDeviceClient.h
+++ b/services/camera/libcameraservice/api2/CameraDeviceClient.h
@@ -352,6 +352,8 @@
 
     // The string representation of object passed into CaptureRequest.setTag.
     std::string mUserTag;
+    // The last set video stabilization mode
+    int mVideoStabilizationMode = -1;
 };
 
 }; // namespace android