Move the flush in AppendCommandsToFile outside the loop.

Move the flush in AppendCommandsToFile outside the loop.
This flush is being called every time we write one single command to the file, causing hundreds of flushes every 2.5s. This is causing jankiness. There is no reason to keep this flush inside the loop, please see the bug for additional details.

R=marja@chromium.org
BUG=245015
Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=265345

[rkc, 2014-04-22 04:16:20]

I've removed the TODO since I believe this _is the appropriate place for this
flush. The related bug can be closed once this CL lands.

[marja, 2014-04-22 08:35:41]

why are you removing the chromeos ifdef?

[rkc, 2014-04-22 08:50:52]

The original code before the removal of the Flush didn't have the #ifdef; but I
suppose we want to keep behavior as is for other platforms.

I put the ifdefs back.

[marja, 2014-04-22 11:30:42]

lgtm

[rkc, 2014-04-22 17:37:20]

The CQ bit was checked by rkc@chromium.org

[commit-bot: I haz the power, 2014-04-22 17:37:51]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/rkc@chromium.org/246573003/20001

[commit-bot: I haz the power, 2014-04-22 18:38:47]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2014-04-22 18:38:47]

Try jobs failed on following builders:
  tryserver.chromium on win_chromium_x64_rel

[rkc, 2014-04-22 20:25:56]

Committed patchset #2 manually as r265345 (presubmit successful).