Isolate elements are treated as neutral in UBA however Blink UBA implementation iterates over all t…

Isolate elements are treated as neutral in UBA however Blink UBA implementation iterates over all the isolate characters.
The purpose of this patch is reduce the algorithm complexity skipping isolate elements when found in the UBA. 
Additionaly, rename the pastEnd variable to lastParagraphEnded.

BUG=

Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=157874

[leviw_travelin_and_unemployed, 2013-09-12 21:04:17]

lgtm

[commit-bot: I haz the power, 2013-09-12 21:04:28]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/igor.o@sisa.samsung.com/24055009/1

[igoroliveira, 2013-09-12 22:52:08]

Levi, could you take a second look? I did small changes in InlineIterator.h

[leviw_travelin_and_unemployed, 2013-09-16 18:12:36]

lgtm, thanks for catching the missing letter ;)

[commit-bot: I haz the power, 2013-09-16 18:14:34]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/igor.o@sisa.samsung.com/24055009/4001

[commit-bot: I haz the power, 2013-09-16 19:21:10]

Retried try job too often on win_blink_rel for step(s) webkit_tests
http://build.chromium.org/p/tryserver.chromium/buildstatus?builder=win_blink_...

[commit-bot: I haz the power, 2013-09-16 20:21:53]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/igor.o@sisa.samsung.com/24055009/4001

[commit-bot: I haz the power, 2013-09-16 20:26:06]

Step "update" is always a major failure.
Look at the try server FAQ for more details.
http://build.chromium.org/p/tryserver.chromium/buildstatus?builder=win_layout...

[commit-bot: I haz the power, 2013-09-16 20:50:29]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/igor.o@sisa.samsung.com/24055009/4001

[commit-bot: I haz the power, 2013-09-16 23:18:42]

Retried try job too often on win_blink_rel for step(s) webkit_tests
http://build.chromium.org/p/tryserver.chromium/buildstatus?builder=win_blink_...

[commit-bot: I haz the power, 2013-09-16 23:44:29]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/igor.o@sisa.samsung.com/24055009/4001

[commit-bot: I haz the power, 2013-09-17 02:09:12]

Change committed as 157874