Enable compositor frame message.

Enable compositor frame message.

The cause of the flaky tests this was causing is now better-understood
and we can re-enable this (the flaky tests are still disabled).

Note that this flag is also enabled by default on phones from Java,
so we should turn it on here to get the behavior everywhere and
stop needing to support the old path.

NOTRY=true
BUG=161945
Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=181994

[aelias_OOO_until_Jul13, 2013-02-12 03:56:47]

Hi Ted,

Let's turn this on everywhere, the current way we toggle it only in some cases
will end up causing confusion.

[Ted C, 2013-02-12 15:32:54]

lgtm

[commit-bot: I haz the power, 2013-02-12 20:21:45]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/aelias@chromium.org/12210132/1

[commit-bot: I haz the power, 2013-02-12 20:25:23]

Change committed as 181994

[boliu, 2013-02-12 23:58:49]

This caused some downstream webview cts tests to fail. I don't see any obvious
pattern to the fail tests though.

[aelias_OOO_until_Jul13, 2013-02-13 00:00:40]

On 2013/02/12 23:58:49, boliu wrote:
> This caused some downstream webview cts tests to fail. I don't see any obvious
> pattern to the fail tests though.

We have seen this for other tests and it was because there was a race condition
involving pageScaleFactor.  This message sends it up much faster than before. 
Please disable and file a bug assigned to aruslan@, he's tackling the tests.