Fix playback rate calculations for WallClockTimeSource.

Fix playback rate calculations for WallClockTimeSource.

The switch to wall clock time used playback rate incorrectly when
calculating the wall clock time. Instead of multiplying by the
rate it should be divided.

BUG=477165
TEST=new unittest

Committed: https://crrev.com/3ec02d642465872d9ab7d7db600d0480a57b3cab
Cr-Commit-Position: refs/heads/master@{#325294}

[DaleCurtis, 2015-04-15 01:36:49]

dalecurtis@chromium.org changed reviewers:
+ xhwang@chromium.org

[DaleCurtis, 2015-04-15 01:37:11]

Whoops :O Forgot these tests earlier. :(

[xhwang, 2015-04-15 04:22:57]

lgtm % nit

https://codereview.chromium.org/1085133002/diff/1/media/base/wall_clock_time_...
File media/base/wall_clock_time_source_unittest.cc (right):

https://codereview.chromium.org/1085133002/diff/1/media/base/wall_clock_time_...
media/base/wall_clock_time_source_unittest.cc:32: bool
IsWallClockNowForMediaTimeInSeconds(int seconds) {
This naming is hard to read. But I don't have better suggestions...

[DaleCurtis, 2015-04-15 18:42:28]

https://codereview.chromium.org/1085133002/diff/1/media/base/wall_clock_time_...
File media/base/wall_clock_time_source_unittest.cc (right):

https://codereview.chromium.org/1085133002/diff/1/media/base/wall_clock_time_...
media/base/wall_clock_time_source_unittest.cc:32: bool
IsWallClockNowForMediaTimeInSeconds(int seconds) {
On 2015/04/15 04:22:57, xhwang wrote:
> This naming is hard to read. But I don't have better suggestions...

Yeah, it's a bit wordy, but explicit :) I've cleaned up the names a little bit.

[DaleCurtis, 2015-04-15 18:42:37]

The CQ bit was checked by dalecurtis@chromium.org

[DaleCurtis, 2015-04-15 18:42:37]

The patchset sent to the CQ was uploaded after l-g-t-m from xhwang@chromium.org
Link to the patchset: https://codereview.chromium.org/1085133002/#ps20001
(title: "Naming.")

[commit-bot: I haz the power, 2015-04-15 18:43:48]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1085133002/20001

[commit-bot: I haz the power, 2015-04-15 20:39:18]

Committed patchset #2 (id:20001)

[commit-bot: I haz the power, 2015-04-15 20:40:12]

Patchset 2 (id:??) landed as
https://crrev.com/3ec02d642465872d9ab7d7db600d0480a57b3cab
Cr-Commit-Position: refs/heads/master@{#325294}