Construct instances of base class from TypedArray.prototype.subarray

Construct instances of base class from TypedArray.prototype.subarray

Previous changes with subclassable builtins and @@species were a bit
aggressive in making TypedArray.prototype.subarray act like the
ES2016 specification in terms of returning an instance of the
subclass as a result. It turns out that Node.js, and extracted
libraries for the web, subclass TypedArrays but don't expect the
subclass constructor to be called by subarray. @@species will provide
an escape hatch, but it has not shipped yet, and will take some time
for uptake by libraries.

For now, this patch makes TypedArray.prototype.subarray fall back to
constructing an instance of the parent TypedArray class, such as
Uint8Array.

R=adamk
LOG=Y
BUG=v8:4665
Committed: https://crrev.com/e13f2ff40bcf2dcfa94d4424438f6d0d3b32acee
Cr-Commit-Position: refs/heads/master@{#33312}

[Dan Ehrenberg, 2016-01-14 05:29:32]

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

[commit-bot: I haz the power, 2016-01-14 05:29:42]

Dry run: CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1583773005/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1583773005/1

[Dan Ehrenberg, 2016-01-14 05:50:26]

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

[commit-bot: I haz the power, 2016-01-14 05:50:35]

Dry run: CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1583773005/20001
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1583773005/20001

[commit-bot: I haz the power, 2016-01-14 06:33:42]

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

[commit-bot: I haz the power, 2016-01-14 06:33:43]

Dry run: This issue passed the CQ dry run.

[adamk, 2016-01-14 19:02:20]

lgtm, and thanks for the quick and minimal fix as a stop-gap

[Dan Ehrenberg, 2016-01-14 19:21:38]

The CQ bit was checked by littledan@chromium.org

[commit-bot: I haz the power, 2016-01-14 19:21:45]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1583773005/20001
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1583773005/20001

[commit-bot: I haz the power, 2016-01-14 19:22:50]

Committed patchset #2 (id:20001)

[commit-bot: I haz the power, 2016-01-14 19:23:31]

Description was changed from

==========
Construct instances of base class from TypedArray.prototype.subarray

Previous changes with subclassable builtins and @@species were a bit
aggressive in making TypedArray.prototype.subarray act like the
ES2016 specification in terms of returning an instance of the
subclass as a result. It turns out that Node.js, and extracted
libraries for the web, subclass TypedArrays but don't expect the
subclass constructor to be called by subarray. @@species will provide
an escape hatch, but it has not shipped yet, and will take some time
for uptake by libraries.

For now, this patch makes TypedArray.prototype.subarray fall back to
constructing an instance of the parent TypedArray class, such as
Uint8Array.

R=adamk
LOG=Y
BUG=v8:4665
==========

to

==========
Construct instances of base class from TypedArray.prototype.subarray

Previous changes with subclassable builtins and @@species were a bit
aggressive in making TypedArray.prototype.subarray act like the
ES2016 specification in terms of returning an instance of the
subclass as a result. It turns out that Node.js, and extracted
libraries for the web, subclass TypedArrays but don't expect the
subclass constructor to be called by subarray. @@species will provide
an escape hatch, but it has not shipped yet, and will take some time
for uptake by libraries.

For now, this patch makes TypedArray.prototype.subarray fall back to
constructing an instance of the parent TypedArray class, such as
Uint8Array.

R=adamk
LOG=Y
BUG=v8:4665

Committed: https://crrev.com/e13f2ff40bcf2dcfa94d4424438f6d0d3b32acee
Cr-Commit-Position: refs/heads/master@{#33312}
==========

[commit-bot: I haz the power, 2016-01-14 19:23:32]

Patchset 2 (id:??) landed as
https://crrev.com/e13f2ff40bcf2dcfa94d4424438f6d0d3b32acee
Cr-Commit-Position: refs/heads/master@{#33312}