VideoEncoderFallback for Android.

Expose VideoEncoderSoftwareFallbackWrapper in Java.

Bug: webrtc:7925
Change-Id: I1e1f7bc0469527f6f6a3b7051535896c3f02611c
Reviewed-on: https://webrtc-review.googlesource.com/22960
Reviewed-by: Magnus Jedvert <magjed@webrtc.org>
Commit-Queue: Anders Carlsson <andersc@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#20698}
diff --git a/sdk/android/BUILD.gn b/sdk/android/BUILD.gn
index b3a7894..e6f4944 100644
--- a/sdk/android/BUILD.gn
+++ b/sdk/android/BUILD.gn
@@ -143,6 +143,7 @@
     "src/jni/videodecoderwrapper.h",
     "src/jni/videoencoderfactorywrapper.cc",
     "src/jni/videoencoderfactorywrapper.h",
+    "src/jni/videoencoderfallback.cc",
     "src/jni/videoencoderwrapper.cc",
     "src/jni/videoencoderwrapper.h",
     "src/jni/videofilerenderer_jni.cc",
@@ -491,6 +492,7 @@
     "api/org/webrtc/VideoDecoderFallback.java",
     "api/org/webrtc/VideoEncoder.java",
     "api/org/webrtc/VideoEncoderFactory.java",
+    "api/org/webrtc/VideoEncoderFallback.java",
     "api/org/webrtc/VideoFileRenderer.java",
     "api/org/webrtc/VideoFrame.java",
     "api/org/webrtc/VideoFrameDrawer.java",