[local; kouhei 1][ES6 modules] Introduce ScriptModuleResolverImpl

[ES6 modules] Introduce ScriptModuleResolverImpl

This CL introduces ScriptModuleResolverImpl, which implements
https://html.spec.whatwg.org/#hostresolveimportedmodule(referencingmodule,-specifier)

This CL also introduces Modulator::getFetchedModuleScript() to synchronously get already fetched ModuleScript from the module map.

BUG=594639
patch from issue 2790473002 at patchset 60001 (http://crrev.com/2790473002#ps60001)

[hiroshige, 2017-04-06 17:58:20]

Description was changed from

==========
[ES6 modules] Introduce ScriptModuleResolverImpl

This CL introduces ScriptModuleResolverImpl, which implements
https://html.spec.whatwg.org/#hostresolveimportedmodule(referencingmodule,-sp...

This CL also introduces Modulator::getFetchedModuleScript() to synchronously get
already fetched ModuleScript from the module map.

BUG=594639

patch from issue 2790473002 at patchset 60001
(http://crrev.com/2790473002#ps60001)
==========

to

==========
[ES6 modules] Introduce ScriptModuleResolverImpl

This CL introduces ScriptModuleResolverImpl, which implements
https://html.spec.whatwg.org/#hostresolveimportedmodule(referencingmodule,-sp...

This CL also introduces Modulator::getFetchedModuleScript() to synchronously get
already fetched ModuleScript from the module map.

BUG=594639

patch from issue 2790473002 at patchset 60001
(http://crrev.com/2790473002#ps60001)
==========

[hiroshige, 2017-04-06 17:58:33]

The CQ bit was checked by hiroshige@chromium.org to run a CQ dry run

[commit-bot: I haz the power, 2017-04-06 17:59:41]

Dry run: CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[commit-bot: I haz the power, 2017-04-06 19:08:10]

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

[commit-bot: I haz the power, 2017-04-06 19:08:10]

Dry run: Try jobs failed on following builders:
  win_chromium_compile_dbg_ng on master.tryserver.chromium.win (JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.win/builders/win_chromium_comp...)