Add [Exposed] to all interfaces

[annevk]

Needed for whatwg/webidl#365.

CSS Pseudo-Elements Module Level 4: CSSPseudoElement, CSSPseudoElementList

CSS Typed OM Level 1: CSSStyleValue, StylePropertyMapReadOnly, StylePropertyMap, CSSUnparsedValue, CSSVariableReferenceValue, CSSKeywordValue, CSSNumericValue, CSSUnitValue, CSSMathValue, CSSMathSum, CSSMathProduct, CSSMathNegate, CSSMathInvert, CSSMathMin, CSSMathMax, CSSNumericArray, CSSTransformValue, CSSTransformComponent, CSSTranslation, CSSRotation, CSSScale, CSSSkew, CSSPerspective, CSSMatrixComponent, CSSPositionValue, CSSResourceValue, CSSImageValue, CSSURLImageValue, CSSFontFaceValue

[csnardi]

I believe this was fixed by #1749 and #2345.

[annevk]

Was web-platform-tests updated too?

[csnardi]

web-platform-tests/wpt#6982 covered CSSOM/CSSOM View, which I believe were the only two existing IDL tests that needed updated for CSS (non-Houdini). web-platform-tests/wpt#10049 added an IDL test for CSS Font Loading with these changes.

web-platform-tests/wpt#9768, web-platform-tests/wpt#9906, and web-platform-tests/wpt#9769 all add IDL tests for these specs which should incorporate the above changes.

[annevk]

Cool, let's close this then. Guess follow-ups can be filed if any are still missing.