Implement bookmarks for ExternalStreamingStream.

Implement bookmarks for ExternalStreamingStream.

(Requires the embedder's ExternalSourceStream implementation to cooperate.
 See crrev.com/1154883003 for Blink.)

R=jochen@chromium.org
BUG=chromium:470930
LOG=Y

Committed: https://crrev.com/85a0542df592cc297f52f00e00d74ada1206efdf
Cr-Commit-Position: refs/heads/master@{#28610}

[jochen (gone - plz use gerrit), 2015-05-22 15:54:30]

lgtm with nit

https://codereview.chromium.org/1156733002/diff/1/include/v8.h
File include/v8.h (right):

https://codereview.chromium.org/1156733002/diff/1/include/v8.h#newcode1226
include/v8.h:1226: virtual bool SetBookmark();
Please add a comment about what this is supposed to do

[jochen (gone - plz use gerrit), 2015-05-22 15:54:30]

lgtm with nit

[vogelheim, 2015-05-26 06:54:52]

On 2015/05/22 15:54:30, jochen wrote:
> lgtm with nit
> 
> https://codereview.chromium.org/1156733002/diff/1/include/v8.h
> File include/v8.h (right):
> 
> https://codereview.chromium.org/1156733002/diff/1/include/v8.h#newcode1226
> include/v8.h:1226: virtual bool SetBookmark();
> Please add a comment about what this is supposed to do

Done.

[vogelheim, 2015-05-26 07:06:55]

The CQ bit was checked by vogelheim@chromium.org

[vogelheim, 2015-05-26 07:06:55]

The patchset sent to the CQ was uploaded after l-g-t-m from jochen@chromium.org
Link to the patchset: https://codereview.chromium.org/1156733002/#ps40001
(title: "Add comments to interface methods.")

[commit-bot: I haz the power, 2015-05-26 07:07:12]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1156733002/40001

[commit-bot: I haz the power, 2015-05-26 07:54:19]

Committed patchset #3 (id:40001)

[commit-bot: I haz the power, 2015-05-26 07:54:30]

Patchset 3 (id:??) landed as
https://crrev.com/85a0542df592cc297f52f00e00d74ada1206efdf
Cr-Commit-Position: refs/heads/master@{#28610}