Faster WTF::toASCIILower() implementation for 8-bit strings

Faster WTF::toASCIILower() implementation for 8-bit strings

WTF::toASCIILower() is used very intensively in various scenarios in blink.
This patch adds a table-based implementation of WTF::toASCIILower() for 8-bit strings, on a simple benchmark it is about 5 times faster than the existing implementation.

The patch uses http://trac.webkit.org/changeset/181512 by Benjamin Poulain <​bpoulain@apple.com>;

Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=197025

[Mikhail, 2015-06-11 14:35:04]

mikhail.pozdnyakov@intel.com changed reviewers:
+ tkent@chromium.org

[Mikhail, 2015-06-12 07:50:25]

PTAL

[tkent, 2015-06-12 07:55:47]

https://codereview.chromium.org/1177163003/diff/20001/Source/wtf/ASCIICTypeTe...
File Source/wtf/ASCIICTypeTest.cpp (right):

https://codereview.chromium.org/1177163003/diff/20001/Source/wtf/ASCIICTypeTe...
Source/wtf/ASCIICTypeTest.cpp:10: TEST(WTF, ASCIICaseFoldTable)
Please change to:

namespace WTF {

TEST(ASCIICTypeTest, ASCIICaseFoldTable)

...


Existing WTF tests have wrong style.

[Mikhail, 2015-06-12 08:04:50]

On 2015/06/12 07:55:47, tkent wrote:
>
https://codereview.chromium.org/1177163003/diff/20001/Source/wtf/ASCIICTypeTe...
> File Source/wtf/ASCIICTypeTest.cpp (right):
> 
>
https://codereview.chromium.org/1177163003/diff/20001/Source/wtf/ASCIICTypeTe...
> Source/wtf/ASCIICTypeTest.cpp:10: TEST(WTF, ASCIICaseFoldTable)
> Please change to:
> 
> namespace WTF {
> 
> TEST(ASCIICTypeTest, ASCIICaseFoldTable)
> 
> ...
> 
> 
> Existing WTF tests have wrong style.

done, thanks

[tkent, 2015-06-12 08:06:16]

The CQ bit was checked by tkent@chromium.org

[tkent, 2015-06-12 08:06:17]

lgtm

[commit-bot: I haz the power, 2015-06-12 08:06:37]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1177163003/40001

[commit-bot: I haz the power, 2015-06-12 09:44:30]

Committed patchset #3 (id:40001) as
https://src.chromium.org/viewvc/blink?view=rev&revision=197025