Initial support for experimental touch-action CSS feature

Initial support for experimental touch-action CSS feature

This adds basic parsing of CSS touch-action from the pointer events
specification: http://www.w3.org/TR/pointerevents/.  This first CL
just adds the runtime enabled touch-action feature (currently test
only) and parsing of the two basic values 'auto' and 'none'.

Intent-to-implement thread:  https://groups.google.com/a/chromium.org/forum/#!topic/blink-dev/K1qk6qZWgIc.

BUG=241964
NOTRY=true

Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=151158

[Rick Byers, 2013-05-22 15:55:48]

Hi Adam,
Can you review this first CL for touch-action?

There are a number of design and implementation details still to be worked out
for touch-action, but they won't have any real effect on the basic parsing
machinery (except that the default value will change, etc.).

Thanks,
  Rick

[Rick Byers, 2013-05-24 17:54:33]

Julien,
Since this is mostly CSS goo, can you review it?

I still need Adam to approve the chromium public API change.

Thanks,
   Rick

[abarth-chromium, 2013-05-24 17:56:52]

The API change looks good, but I don't want to stamp the CL until the rest gets
a proper review.

[eseidel, 2013-05-24 20:24:33]

lgtm

An impressive amount of boilerplate. :(

https://codereview.chromium.org/15748002/diff/9001/Source/core/css/CSSParserM...
File Source/core/css/CSSParserMode.h (right):

https://codereview.chromium.org/15748002/diff/9001/Source/core/css/CSSParserM...
Source/core/css/CSSParserMode.h:72: bool isCSSTouchActionEnabled;
I think CSSParserMode is an older way of doing runtime enables like this.  But
it's  possible it still serves a use.

https://codereview.chromium.org/15748002/diff/9001/Source/core/css/CSSPrimiti...
File Source/core/css/CSSPrimitiveValueMappings.h (right):

https://codereview.chromium.org/15748002/diff/9001/Source/core/css/CSSPrimiti...
Source/core/css/CSSPrimitiveValueMappings.h:4502: template<> inline
CSSPrimitiveValue::CSSPrimitiveValue(TouchAction t)
Lame that we don't autogen this stuff yet. :)

[Rick Byers, 2013-05-24 20:51:48]

On 2013/05/24 20:24:33, eseidel wrote:
> lgtm
> 
> An impressive amount of boilerplate. :(

Yeah, but at least we're chipping away at it.  Over the live of this CL on my
machine, I've simplified it when you landed your RuntimeEnabledFeatures codegen,
and then again when mikelawther landed the StyleBuilder codegen.

>
https://codereview.chromium.org/15748002/diff/9001/Source/core/css/CSSParserM...
> File Source/core/css/CSSParserMode.h (right):
> 
>
https://codereview.chromium.org/15748002/diff/9001/Source/core/css/CSSParserM...
> Source/core/css/CSSParserMode.h:72: bool isCSSTouchActionEnabled;
> I think CSSParserMode is an older way of doing runtime enables like this.  But
> it's  possible it still serves a use.

Ah, nope looks like I can kill it.  I missed that there were examples of
runtime-enabled CSS that weren't relying on this.  Thanks. 
 
>
https://codereview.chromium.org/15748002/diff/9001/Source/core/css/CSSPrimiti...
> File Source/core/css/CSSPrimitiveValueMappings.h (right):
> 
>
https://codereview.chromium.org/15748002/diff/9001/Source/core/css/CSSPrimiti...
> Source/core/css/CSSPrimitiveValueMappings.h:4502: template<> inline
> CSSPrimitiveValue::CSSPrimitiveValue(TouchAction t)
> Lame that we don't autogen this stuff yet. :)

[abarth-chromium, 2013-05-24 20:53:06]

API change LGTM

[commit-bot: I haz the power, 2013-05-24 20:54:00]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/rbyers@chromium.org/15748002/16001

[commit-bot: I haz the power, 2013-05-24 22:25:14]

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

[commit-bot: I haz the power, 2013-05-25 12:08:45]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/rbyers@chromium.org/15748002/16001

[commit-bot: I haz the power, 2013-05-25 13:18:12]

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

[commit-bot: I haz the power, 2013-05-25 17:50:42]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/rbyers@chromium.org/15748002/16001

[commit-bot: I haz the power, 2013-05-25 18:54:43]

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

[commit-bot: I haz the power, 2013-05-26 00:30:40]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/rbyers@chromium.org/15748002/16001

[commit-bot: I haz the power, 2013-05-26 00:31:16]

Change committed as 151158