deadbeef 55b0b37554 Use a better method to generate a random ID in IvfFileWriterTest.
It was generating a random ID using the test case's "this" pointer
and the current time. However, the current time may be imprecise. And
the "this" pointer may have repeatable values.

BUG=webrtc:5898

Review-Url: https://codereview.webrtc.org/2190533004
Cr-Commit-Position: refs/heads/master@{#13560}
2016-07-28 17:51:14 +00:00
..
2016-06-16 13:51:40 +00:00