Document.write should always be processed synchronously regardless of bg parser

Document.write should always be processed synchronously regardless of bg parser

Before this CL, document.write() was not processed synchronously when there
are pending ParsedChunks from BackgroundHTMLParser.

HTMLParserScheduler historically used to control both BackgroundHTMLParser
pumps and asynchronous main thread parsing.
Now that main thread parsing is only used for synchronous parsing, there is no reason
that main thread parsing path should query HTMLParserScheduler status.
This CL modifies pumpTokenizerIfPossible(), which is a method used only
in main thread parsing, to not wait for HTMLParserScheduler to schedule its
pumping.

This CL addresses flakinesses seen in inspector/sources/debugger tests from
Blink Scheduler changes.

TESTS=inspector/sources/debugger/
BUG=437176
Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=186159

[kouhei (in TOK), 2014-11-28 01:53:03]

kouhei@chromium.org changed reviewers:
+ haraken@chromium.org, tyoshino@chromium.org, yhirano@chromium.org,
yutak@chromium.org

[kouhei (in TOK), 2014-11-28 01:53:04]

Would you take a look?

[Yuta Kitamura, 2014-11-28 08:00:48]

Based on the change description, this patch seems fine. LGTM

[kouhei (in TOK), 2014-11-28 08:18:50]

The CQ bit was checked by kouhei@chromium.org

[commit-bot: I haz the power, 2014-11-28 08:19:37]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/764963002/1

[commit-bot: I haz the power, 2014-11-28 08:21:32]

Committed patchset #1 (id:1) as
https://src.chromium.org/viewvc/blink?view=rev&revision=186159