[marge-m59] Add "mark promise as handled" change to pipeThrough()

[marge-m59] Add "mark promise as handled" change to pipeThrough()

Update the implementation of ReadableStream pipeThrough() with standard change
https://github.com/whatwg/streams/commit/94140088224c1a0e219c630378d1fa7985d657a9

This makes it mark the Promise returned by pipeTo() as handled to avoid
uncatchable rejections when pipeTo fails.

TBR=tyoshino
BUG=714076
Review-Url: https://codereview.chromium.org/2796633002
Cr-Commit-Position: refs/heads/master@{#464718}
(cherry picked from commit 1e9fa3b2e7dca2ba228b9720570512676ed23798)

Review-Url: https://codereview.chromium.org/2837753002 .
Cr-Commit-Position: refs/branch-heads/3071@{#153}
Cr-Branched-From: a106f0abbf69dad349d4aaf4bcc4f5d376dd2377-refs/heads/master@{#464641}
Committed: https://chromium.googlesource.com/chromium/src/+/d1f38b5f8bbfe40aacfafabe89dc1de7f465db9d

[Adam Rice, 2017-04-24 02:08:14]

Description was changed from

==========
[marge-m59] Add "mark promise as handled" change to pipeThrough()

Update the implementation of ReadableStream pipeThrough() with standard change
https://github.com/whatwg/streams/commit/94140088224c1a0e219c630378d1fa7985d6...

This makes it mark the Promise returned by pipeTo() as handled to avoid
uncatchable rejections when pipeTo fails.

TBR=tyoshino
BUG=714076

Review-Url: https://codereview.chromium.org/2796633002
Cr-Commit-Position: refs/heads/master@{#464718}
(cherry picked from commit 1e9fa3b2e7dca2ba228b9720570512676ed23798)
==========

to

==========
[marge-m59] Add "mark promise as handled" change to pipeThrough()

Update the implementation of ReadableStream pipeThrough() with standard change
https://github.com/whatwg/streams/commit/94140088224c1a0e219c630378d1fa7985d6...

This makes it mark the Promise returned by pipeTo() as handled to avoid
uncatchable rejections when pipeTo fails.

TBR=tyoshino
BUG=714076

Review-Url: https://codereview.chromium.org/2796633002
Cr-Commit-Position: refs/heads/master@{#464718}
(cherry picked from commit 1e9fa3b2e7dca2ba228b9720570512676ed23798)

Review-Url: https://codereview.chromium.org/2837753002 .
Cr-Commit-Position: refs/branch-heads/3071@{#153}
Cr-Branched-From:
a106f0abbf69dad349d4aaf4bcc4f5d376dd2377-refs/heads/master@{#464641}
Committed:
https://chromium.googlesource.com/chromium/src/+/d1f38b5f8bbfe40aacfafabe89dc...
==========

[Adam Rice, 2017-04-24 02:08:17]

Committed patchset #1 (id:1) manually as
d1f38b5f8bbfe40aacfafabe89dc1de7f465db9d (presubmit successful).

[tyoshino (SeeGerritForStatus), 2017-04-24 04:05:29]

lgtm