[CSS Exclusions] Add flag to enable / disable exclusions at runtime

[CSS Exclusions] Add flag to enable / disable exclusions at runtime
https://bugs.webkit.org/show_bug.cgi?id=83313

Patch by Bear Travis <betravis@adobe.com> on 2012-04-12
Reviewed by Ryosuke Niwa.

.:

Adding the GTK symbols

* Source/autotools/symbols.filter:

Source/WebCore:

Adding setCSSExclusionsEnabled/cssExclusionsEnabled that is true by default.
The CSS parser will not accept values for the exclusions properties when
cssExclusionsEnabled is false. However, you will still get the default value
in the computed style.

Test: fast/exclusions/css-exclusions-disabled.html

* WebCore.exp.in:
* bindings/generic/RuntimeEnabledFeatures.cpp:
(WebCore):
* bindings/generic/RuntimeEnabledFeatures.h:
(WebCore::RuntimeEnabledFeatures::setCSSExclusionsEnabled):
(WebCore::RuntimeEnabledFeatures::cssExclusionsEnabled):
(RuntimeEnabledFeatures):
* css/CSSParser.cpp:
(WebCore::isSimpleLengthValue):
(WebCore::isValidKeywordPropertyAndValue):
(WebCore::CSSParser::parseValue):
* testing/InternalSettings.cpp:
(WebCore::InternalSettings::InternalSettings):
(WebCore::InternalSettings::restoreTo):
(WebCore::InternalSettings::setCSSExclusionsEnabled):
(WebCore):
* testing/InternalSettings.h:
(InternalSettings):
* testing/InternalSettings.idl:

Source/WebKit2:

Adding windows symbols

* win/WebKit2.def:
* win/WebKit2CFLite.def:

LayoutTests:

Adding a test to cover CSS parsing, which is the only piece of exclusions
work in place. Updating other exclusions test to explicitly enable the
feature.

* fast/exclusions/css-exclusions-disabled-expected.txt: Added.
* fast/exclusions/css-exclusions-disabled.html: Added.
* fast/exclusions/script-tests/parsing-wrap-shape-inside.js:
* fast/exclusions/script-tests/parsing-wrap-shape-outside.js:
* fast/exclusions/script-tests/wrap-flow-parsing.js:
* fast/exclusions/script-tests/wrap-margin-parsing.js:
* fast/exclusions/script-tests/wrap-padding-parsing.js:
* fast/exclusions/script-tests/wrap-parsing.js:
* fast/exclusions/script-tests/wrap-through-parsing.js:

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@114020 268f45cc-cd09-0410-ab3c-d52691b4dbfc