Add support for capturers to capture VideoFrames.

webrtc/sdk/android/src/jni/androidvideotracksource.h

Index: webrtc/sdk/android/src/jni/androidvideotracksource.h
diff --git a/webrtc/sdk/android/src/jni/androidvideotracksource.h b/webrtc/sdk/android/src/jni/androidvideotracksource.h
index 292c7e0e5184f054d7b8b1636bd220f447c31c17..92bc71b24a1b33edcdb7e4a879464b55d6f47751 100644
--- a/webrtc/sdk/android/src/jni/androidvideotracksource.h
+++ b/webrtc/sdk/android/src/jni/androidvideotracksource.h
@@ -11,6 +11,8 @@
 #ifndef WEBRTC_API_ANDROID_JNI_ANDROIDVIDEOTRACKSOURCE_H_
 #define WEBRTC_API_ANDROID_JNI_ANDROIDVIDEOTRACKSOURCE_H_
 
+#include <jni.h>
+
 #include "webrtc/common_video/include/i420_buffer_pool.h"
 #include "webrtc/common_video/libyuv/include/webrtc_libyuv.h"
 #include "webrtc/media/base/adaptedvideotracksource.h"
@@ -59,6 +61,13 @@ class AndroidVideoTrackSource : public rtc::AdaptedVideoTrackSource {
                               int64_t timestamp_ns,
                               const webrtc_jni::NativeHandleImpl& handle);
 
+  void OnFrameCaptured(JNIEnv* jni,
+                       int width,
+                       int height,
+                       int64_t timestamp_ns,
+                       VideoRotation rotation,
+                       jobject j_video_frame_buffer);
+
   void OnOutputFormatRequest(int width, int height, int fps);
 
   rtc::scoped_refptr<webrtc_jni::SurfaceTextureHelper>
@@ -75,7 +84,10 @@ class AndroidVideoTrackSource : public rtc::AdaptedVideoTrackSource {
   NV12ToI420Scaler nv12toi420_scaler_;
   I420BufferPool buffer_pool_;
   rtc::scoped_refptr<webrtc_jni::SurfaceTextureHelper> surface_texture_helper_;
+  webrtc_jni::AndroidVideoBufferFactory video_buffer_factory_;
   const bool is_screencast_;
+
+  jmethodID j_crop_and_scale_id_;
 };
 
 }  // namespace webrtc