I decided to make one webrtc/sdk/android/BUILD.gn for both tests and Java/jni src. External dependencies needs to be updated after this CL. Future work is required to clean up the Android api and move implementation details to /webrtc/sdk/android/src. BUG=webrtc:5882,webrtc:6804 NOPRESUBMIT=True Review-Url: https://codereview.webrtc.org/2547483003 Cr-Commit-Position: refs/heads/master@{#15443}