Revert of Android: Remove VideoCapturer (patchset #2 id:20001 of https://codereview.webrtc.org/1684403002/ )

Reason for revert:
Breaks downstream compilation. Please reland in a non-breaking fashion.

Original issue's description:
> Android: Remove VideoCapturer
>
> This CL makes PeerConnectionFactory.createVideoSource() and nativeCreateVideoSource work directly with VideoCapturerAndroid instead of going via VideoCapturer. The native part is now created in nativeCreateVideoSource() instead of doing it immediately in VideoCapturerAndroid.create().
>
> BUG=webrtc:5519
> R=perkj@webrtc.org
>
> Committed: https://crrev.com/09eab315fddc3432c19d8f662f4b9360f2a58010
> Cr-Commit-Position: refs/heads/master@{#11582}

TBR=perkj@webrtc.org,magjed@webrtc.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=webrtc:5519

Review URL: https://codereview.webrtc.org/1690073002

Cr-Commit-Position: refs/heads/master@{#11586}

webrtc/api/java/jni/androidvideocapturer_jni.cc

@@ -213,4 +213,16 @@ JOW(void, VideoCapturerAndroid_00024NativeObserver_nativeOnOutputFormatRequest)
       j_width, j_height, j_fps);
 }
 
+JOW(jlong, VideoCapturerAndroid_nativeCreateVideoCapturer)
+    (JNIEnv* jni, jclass,
+     jobject j_video_capturer, jobject j_surface_texture_helper) {
+  rtc::scoped_refptr<webrtc::AndroidVideoCapturerDelegate> delegate =
+      new rtc::RefCountedObject<AndroidVideoCapturerJni>(
+          jni, j_video_capturer, j_surface_texture_helper);
+  rtc::scoped_ptr<cricket::VideoCapturer> capturer(
+      new webrtc::AndroidVideoCapturer(delegate));
+  // Caller takes ownership of the cricket::VideoCapturer* pointer.
+  return jlongFromPointer(capturer.release());
+}
+
 }  // namespace webrtc_jni