AndroidVideoCapturer: Return frames that have been dropped
AndroidVideoCapturer: Return frames that have been dropped

Currently, we only return frames if CreateAliasedFrame() is called, which is not the case for dropped frames.

Review URL: https://codereview.webrtc.org/1268333005

Cr-Original-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#9683}
Cr-Mirrored-From: https://chromium.googlesource.com/external/webrtc
Cr-Mirrored-Commit: fcf8ece6ba1d170fc70a457d93b35eccb3074022

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