[Part 5] Parse color value for custom() function parameters
https://bugs.webkit.org/show_bug.cgi?id=114902

Reviewed by Dean Jackson.

Source/WebCore:

Custom filter parameters should support color values. Added parsing
and style resolving bits to support color values. A later patch will
add the color values to the shader program.

https://dvcs.w3.org/hg/FXTF/raw-file/tip/filters/index.html#custom-filter-parameters

Modified existing tests to cover changes.

* GNUmakefile.list.am: Added CustomFilterColorParameter to support color values
    as custom filter parameters.
* Target.pri:
* WebCore.vcproj/WebCore.vcproj:
* WebCore.vcxproj/WebCore.vcxproj:
* WebCore.vcxproj/WebCore.vcxproj.filters:
* WebCore.xcodeproj/project.pbxproj:
* css/CSSComputedStyleDeclaration.cpp:
(WebCore::valueForCustomFilterColorParameter):
(WebCore):
(WebCore::valueForCustomFilterParameter):
* css/CSSParser.cpp:
(WebCore::CSSParser::parseCustomFilterParameters):
* css/StyleResolver.cpp:
(WebCore::StyleResolver::parseCustomFilterColorParameter):
(WebCore):
(WebCore::StyleResolver::parseCustomFilterParameter):
* css/StyleResolver.h:
(StyleResolver):
* platform/graphics/filters/CustomFilterColorParameter.h: Added.
(WebCore):
(WebCore::blendFunc):
(CustomFilterColorParameter):
(WebCore::CustomFilterColorParameter::create):
(WebCore::CustomFilterColorParameter::blend):
(WebCore::CustomFilterColorParameter::color):
(WebCore::CustomFilterColorParameter::setColor):
(WebCore::CustomFilterColorParameter::operator==):
(WebCore::CustomFilterColorParameter::CustomFilterColorParameter):
(WebCore::CustomFilterColorParameter::~CustomFilterColorParameter):
* platform/graphics/filters/CustomFilterParameter.h:
(CustomFilterParameter):
* platform/graphics/filters/CustomFilterRenderer.cpp:
(WebCore::CustomFilterRenderer::bindProgramParameters):

LayoutTests:

Added tests for color parameters on custom fiter function and parameter descriptor.

* css3/filters/custom-with-at-rule-syntax/parsing-custom-function-invalid-expected.txt:
* css3/filters/custom-with-at-rule-syntax/parsing-custom-function-valid-expected.txt:
* css3/filters/custom-with-at-rule-syntax/parsing-parameters-property-invalid-expected.txt:
* css3/filters/custom-with-at-rule-syntax/parsing-parameters-property-valid-expected.txt:
* css3/filters/custom-with-at-rule-syntax/script-tests/parsing-custom-function-invalid.js:
* css3/filters/custom-with-at-rule-syntax/script-tests/parsing-custom-function-valid.js:
* css3/filters/custom-with-at-rule-syntax/script-tests/parsing-parameters-property-invalid.js:
* css3/filters/custom-with-at-rule-syntax/script-tests/parsing-parameters-property-valid.js:


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@148802 268f45cc-cd09-0410-ab3c-d52691b4dbfc