fix for high resolution timer on windows.

fix for high resolution timer on windows.

The CLs here
https://codereview.chromium.org/489793003
and here
https://codereview.chromium.org/395913006

In isolation look correct but taken together cause a overflow or underflow
bug. Basically the message loop was calling Time::ActivateHighResolutionTimer(false)
all the time (or very often) so the g_high_res_timer_count was underflowing
or overflowing.

Now messageloop only calls ActivateHighResolutionTimer in a balanced way.

This can make the base_unittests fail as well with
--gtest_filter=MessageLoopTest.HighResolutionTimer

BUG=153139
TEST=included, see bug for manual testing.

Committed: https://crrev.com/3365a510b17169457292bdb6144cc8b95fb7ea34
Cr-Commit-Position: refs/heads/master@{#293434}

[cpu_(ooo_6.6-7.5), 2014-09-04 22:53:27]

cpu@chromium.org changed reviewers:
+ jamesr@chromium.org, thakis@chromium.org

[cpu_(ooo_6.6-7.5), 2014-09-04 22:53:39]

ptal

[jamesr, 2014-09-04 22:56:03]

lgtm

https://codereview.chromium.org/541203002/diff/1/base/time/time_win.cc
File base/time/time_win.cc (right):

https://codereview.chromium.org/541203002/diff/1/base/time/time_win.cc#newcode95
base/time/time_win.cc:95: unsigned int g_high_res_timer_count = 0;
uint32_t

'unsigned int' is redundant and we don't typically use just 'unsigned'

https://codereview.chromium.org/541203002/diff/1/base/time/time_win.cc#newcod...
base/time/time_win.cc:200: const unsigned int max = std::numeric_limits<unsigned
int>::max();
uint32_t

[Nico, 2014-09-04 23:07:56]

lgtm

[cpu_(ooo_6.6-7.5), 2014-09-04 23:21:39]

The CQ bit was checked by cpu@chromium.org

[commit-bot: I haz the power, 2014-09-04 23:24:06]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/cpu@chromium.org/541203002/20001

[commit-bot: I haz the power, 2014-09-05 04:30:50]

Committed patchset #2 (id:20001) as aea6dacaebfaa582e88ed2703b65b2c44ed6c22d

[commit-bot: I haz the power, 2014-09-10 03:36:40]

Patchset 2 (id:??) landed as
https://crrev.com/3365a510b17169457292bdb6144cc8b95fb7ea34
Cr-Commit-Position: refs/heads/master@{#293434}