Improve 2D Canvas Text Metrics Test

Improve 2D Canvas Text Metrics Test

Instead of a somewhat arbitrary timeout which may introduce flakiness
and trying to force the font load through an HTML element using the font,
I suggest to use explicit font loading events.
CanvasTest.ttf only contains test glyphs for [A-E], the test
strings "Some Text", "M", "q" will use fallback fonts which lead to
platform specific variations.
Since this was never an original Philip Canvas Text, I think it's
okay to load a web font explicitly from outside the Philip
suite.

BUG=460866
R=sugoi,eae,jbroman

Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=192429

[eae, 2015-02-23 18:40:38]

LGTM

[eae, 2015-02-23 18:40:42]

The CQ bit was checked by eae@chromium.org

[commit-bot: I haz the power, 2015-02-23 18:41:36]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/950773003/20001

[commit-bot: I haz the power, 2015-02-23 18:51:54]

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

[commit-bot: I haz the power, 2015-02-23 18:51:54]

Try jobs failed on following builders:
  mac_blink_rel on tryserver.blink (JOB_FAILED,
http://build.chromium.org/p/tryserver.blink/builders/mac_blink_rel/builds/44179)

[Dominik Röttsches, 2015-02-24 08:47:29]

Rebaselined TestExpectations

[Dominik Röttsches, 2015-02-24 09:17:54]

The CQ bit was checked by dominik.rottsches@intel.com

[Dominik Röttsches, 2015-02-24 09:17:54]

The patchset sent to the CQ was uploaded after l-g-t-m from eae@chromium.org
Link to the patchset: https://codereview.chromium.org/950773003/#ps40001 (title:
"Rebaselined TestExpectations")

[commit-bot: I haz the power, 2015-02-24 09:22:46]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/950773003/40001

[commit-bot: I haz the power, 2015-02-24 11:55:47]

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

[commit-bot: I haz the power, 2015-02-24 11:55:47]

Try jobs failed on following builders:
  win_blink_rel on tryserver.blink (JOB_FAILED,
http://build.chromium.org/p/tryserver.blink/builders/win_blink_rel/builds/52082)

[Dominik Röttsches, 2015-03-24 12:43:42]

The CQ bit was checked by dominik.rottsches@intel.com

[Dominik Röttsches, 2015-03-24 12:43:43]

The patchset sent to the CQ was uploaded after l-g-t-m from eae@chromium.org
Link to the patchset: https://codereview.chromium.org/950773003/#ps60001 (title:
"Adding missing endTest() statements")

[commit-bot: I haz the power, 2015-03-24 12:44:02]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/950773003/60001

[commit-bot: I haz the power, 2015-03-24 12:47:59]

Committed patchset #4 (id:60001) as
https://src.chromium.org/viewvc/blink?view=rev&revision=192429