Implement a character stream for external one byte streams

Implement a character stream for external one byte streams

In contrast to the generic stream, this character stream works without
accessing the heap, and can be used on a background thread.

BUG=v8:5215
R=vogelheim@chromium.org,marja@chromium.org

Committed: https://crrev.com/a661f611232bc49f37cff60c0e00112192e30d88
Cr-Commit-Position: refs/heads/master@{#38154}

[jochen (gone - plz use gerrit), 2016-07-28 12:35:23]

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

[commit-bot: I haz the power, 2016-07-28 12:35:30]

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, 2016-07-28 12:56:40]

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

[commit-bot: I haz the power, 2016-07-28 12:56:41]

Dry run: This issue passed the CQ dry run.

[vogelheim, 2016-07-28 15:03:13]

lgtm

https://codereview.chromium.org/2184393002/diff/1/src/parsing/scanner-charact...
File src/parsing/scanner-character-streams.cc (right):

https://codereview.chromium.org/2184393002/diff/1/src/parsing/scanner-charact...
src/parsing/scanner-character-streams.cc:624: size_t length = kBufferSize;
maybe: length = Min(kBufferSize, length_ - from_pos) 

[slightly shorter than assign + if]

[jochen (gone - plz use gerrit), 2016-07-29 05:47:14]

The CQ bit was checked by jochen@chromium.org

[jochen (gone - plz use gerrit), 2016-07-29 05:47:14]

The patchset sent to the CQ was uploaded after l-g-t-m from
vogelheim@chromium.org
Link to the patchset: https://codereview.chromium.org/2184393002/#ps20001
(title: "updates")

[commit-bot: I haz the power, 2016-07-29 05:47:19]

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, 2016-07-29 06:12:13]

Committed patchset #2 (id:20001)

[commit-bot: I haz the power, 2016-07-29 06:13:48]

Description was changed from

==========
Implement a character stream for external one byte streams

In contrast to the generic stream, this character stream works without
accessing the heap, and can be used on a background thread.

BUG=v8:5215
R=vogelheim@chromium.org,marja@chromium.org
==========

to

==========
Implement a character stream for external one byte streams

In contrast to the generic stream, this character stream works without
accessing the heap, and can be used on a background thread.

BUG=v8:5215
R=vogelheim@chromium.org,marja@chromium.org

Committed: https://crrev.com/a661f611232bc49f37cff60c0e00112192e30d88
Cr-Commit-Position: refs/heads/master@{#38154}
==========

[commit-bot: I haz the power, 2016-07-29 06:13:49]

Patchset 2 (id:??) landed as
https://crrev.com/a661f611232bc49f37cff60c0e00112192e30d88
Cr-Commit-Position: refs/heads/master@{#38154}