Add limit for minimum number of required samples before recording input and sent framerate stats.

BUG=

Review URL: https://codereview.webrtc.org/1446443002

Cr-Original-Commit-Position: refs/heads/master@{#10644}
Cr-Mirrored-From: https://chromium.googlesource.com/external/webrtc
Cr-Mirrored-Commit: 6f14be8df8b67feb480f55b3a41e2b8cd06a836d
2 files changed