tree 4407aef700327c5539160131de833509e1ecab88
parent 1f0ad1085d658dc4db783a1e4280ab8d2fffc7ea
author nisse <nisse@webrtc.org> 1464182717 -0700
committer Commit bot <commit-bot@chromium.org> 1464182726 +0000

Let VideoRenderFrames::FrameToRender return a rtc::Optional.

This eliminates one use of IsZeroSize.

BUG=webrtc:5682

Review-Url: https://codereview.webrtc.org/2008513003
Cr-Commit-Position: refs/heads/master@{#12891}