Expose Resource Timing methods and attribute in workers

Expose Resource Timing methods and attribute in workers

This patch makes the Resource Timing extensions to the Performance
interface [1] available in Workers, behind the experimental flag.
Unfortunately those are still prefixed in window.performance, so
prefixed in workers too.

Intent to Implement and Ship:
https://groups.google.com/a/chromium.org/forum/#!topic/blink-dev/htsW078UcFA

[1] http://www.w3.org/TR/resource-timing/#extensions-performance-interface

BUG=465641
TEST=http/tests/workers,http/tests/serviceworker

Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=197713

[Kunihiko Sakamoto, 2015-06-24 06:57:01]

ksakamoto@chromium.org changed reviewers:
+ kinuko@chromium.org, tkent@chromium.org

[kinuko, 2015-06-24 07:11:26]

lgtm

It'd be nice to unprefix these but it'd need different intent/process...

https://codereview.chromium.org/1211443002/diff/1/LayoutTests/http/tests/work...
File LayoutTests/http/tests/workers/resources/performance-timeline-worker.js
(right):

https://codereview.chromium.org/1211443002/diff/1/LayoutTests/http/tests/work...
LayoutTests/http/tests/workers/resources/performance-timeline-worker.js:48:
performance.webkitSetResourceTimingBufferSize(expectedResources.length);
omg... ok so they're also prefixed on window.

[tkent, 2015-06-24 07:12:00]

lgtm

https://codereview.chromium.org/1211443002/diff/1/Source/core/timing/WorkerPe...
File Source/core/timing/WorkerPerformance.idl (right):

https://codereview.chromium.org/1211443002/diff/1/Source/core/timing/WorkerPe...
Source/core/timing/WorkerPerformance.idl:43:
[RuntimeEnabled=ServiceWorkerPerformanceTimeline,
MeasureAs=PrefixedPerformanceClearResourceTimings] void
webkitClearResourceTimings();
It's unfortunate to ship new prefixed functions...  But we don't have unprefixed
versions.

[Kunihiko Sakamoto, 2015-06-24 08:00:01]

The CQ bit was checked by ksakamoto@chromium.org

[commit-bot: I haz the power, 2015-06-24 08:00:12]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1211443002/1

[commit-bot: I haz the power, 2015-06-24 08:04:18]

Committed patchset #1 (id:1) as
https://src.chromium.org/viewvc/blink?view=rev&revision=197713