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This is a reland of bde742c2

This reland contains fixes for:
- Issue 839236 (by adding a dependency in core/script/BUILD.gn), and
- A unit test failure that caused revert
  https://chromium-review.googlesource.com/1042065
  (by adding skip_minify flag as the minifier inserted
  unexpected newlines to scripts)

TBR=kinuko@chromium.org,kouhei@chromium.org

Original change's description:
> [Layered API] Implement Layered API infrastructure behind a flag
>
> This CL
> 1. Maps std:x|y URLs to std:x (according to the draft spec [1]),
> 2. Then maps to std-internal://x/index.js (not spec'ed [2])
>    in GetInternalURL(),
> 3. Then retrieves and serves the script contents for std-internal:
>    URLs in GetSourceText() using ui::ResourceBundle()
>    from blink_resources.pak.
>
> The source JavaScript files for Layered APIs are placed under
> third_party/blink/renderer/core/script/resources/layered_api
> and bundled into blink_resources.pak.
>
> This CL introduces std: and std-internal: schemes that are used in Blink side
> (std: is user-facing while std-internal: is mostly invisible for users)
> but not outside Blink.
>
> [1] Spec:
> https://github.com/drufball/layered-apis/blob/master/spec.md
> [2] Implementation design doc:
> https://docs.google.com/document/d/1V-WaCZQbBcQJRSYSYBb8Y6p0DOdDpiNDSmD41ui_73s/edit
>
> Bug: 829084
> Change-Id: I61fc0a2f17d937db6e859303ab8a84e4b2b87850
> Reviewed-on: https://chromium-review.googlesource.com/1013321
> Commit-Queue: Hiroshige Hayashizaki <hiroshige@chromium.org>
> Reviewed-by: Kinuko Yasuda <kinuko@chromium.org>
> Reviewed-by: Kouhei Ueno <kouhei@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#555524}

Bug: 829084, 839236
Change-Id: I37ed111cf924b52f5998c1e6a2b6dd7d1965c813
Reviewed-on: https://chromium-review.googlesource.com/1042616
Commit-Queue: Hiroshige Hayashizaki <hiroshige@chromium.org>
Reviewed-by: Nico Weber <thakis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#555961}