Bug 1295456 - Support percentage opacity value in CSS color functions. r=dholbert

--HG--
extra : rebase_source : 79bf692da80a5ea861482e9bc021834f60b6d81a
extra : histedit_source : 384f41d812fecf511be8b319d91a687e9c02673d

dom/locales/en-US/chrome/layout/css.properties

@@ -98,6 +98,7 @@ PEColorNotColor=Expected color but found ‘%1$S’.
 PEColorComponentEOF=color component
 PEExpectedPercent=Expected a percentage but found ‘%1$S’.
 PEExpectedInt=Expected an integer but found ‘%1$S’.
+PEExpectedNumberOrPercent=Expected a number or a percentage but found ‘%1$S’.
 PEColorBadRGBContents=Expected number or percentage in rgb() but found ‘%1$S’.
 PEColorComponentBadTerm=Expected ‘%2$S’ but found ‘%1$S’.
 PEColorHueEOF=hue

layout/style/nsCSSParser.cpp

@@ -6972,8 +6972,9 @@ CSSParserImpl::ParseColorOpacity(float& aOpacity)
     return false;
   }
 
-  if (mToken.mType != eCSSToken_Number) {
-    REPORT_UNEXPECTED_TOKEN(PEExpectedNumber);
+  // eCSSToken_Number or eCSSToken_Percentage.
+  if (mToken.mType != eCSSToken_Number && mToken.mType != eCSSToken_Percentage) {
+    REPORT_UNEXPECTED_TOKEN(PEExpectedNumberOrPercent);
     UngetToken();
     return false;
   }