Reland: Video capture Android: enable unittests for Camera2 API

media/capture/video/android/video_capture_device_android.cc

Index: media/capture/video/android/video_capture_device_android.cc
diff --git a/media/capture/video/android/video_capture_device_android.cc b/media/capture/video/android/video_capture_device_android.cc
index eaae7bdfae03c1ecd5d6d5795dd14a58f1781f27..4687bfe1f709bbf4ed19e4c2bb1b25844616d0ec 100644
--- a/media/capture/video/android/video_capture_device_android.cc
+++ b/media/capture/video/android/video_capture_device_android.cc
@@ -428,6 +428,10 @@ void VideoCaptureDeviceAndroid::OnPhotoTaken(
   photo_callbacks_.erase(reference_it);
 }
 
+void VideoCaptureDeviceAndroid::ConfigureForTesting() {
+  Java_VideoCapture_setTestMode(AttachCurrentThread(), j_capture_);
+}
+
 VideoPixelFormat VideoCaptureDeviceAndroid::GetColorspace() {
   JNIEnv* env = AttachCurrentThread();
   const int current_capture_colorspace =