Set scaling limit at 320 * 180 for all implementations.
Set scaling limit at 320 * 180 for all implementations.

The MediaCodec decoder on android has trouble decoding video at
so low resolutions. We set the limit a bit higher for all implementations
pending a robust software fallback implementation for MediaCodec.

BUG=webrtc:7206

Review-Url: https://codereview.webrtc.org/2709153002
Cr-Original-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#16798}
Cr-Mirrored-From: https://chromium.googlesource.com/external/webrtc
Cr-Mirrored-Commit: 560ddb7321f2ae42ff1eb4c79d7c65d59f61dfe2

Alkalyne/webrtctrunk,Alkalyne/webrtctrunk,Alkalyne/webrtctrunk,Alkalyne/webrtctrunk,Alkalyne/webrtctrunk,Alkalyne/webrtctrunk,Alkalyne/webrtctrunk,Alkalyne/webrtctrunk