Accept comments as separators in rgba/hsla

In order to make this work, because comments are already stripped
by the time ParseRGBParameters/ParseHSLParameters is reached, relax
the strictness and simply require the color components to be there.

This works since although the comment is stripped out, the effect is
that it still acts as a separator and will preserve numeric tokens:
1/* comment */2 -> NumericToken(1) + NumericToken(2)

Behavior matches Firefox.

Bug: 808888

Change-Id: I43ae53a0d7630b8229745a347c5fb914f8949589
Reviewed-on: https://chromium-review.googlesource.com/962989Reviewed-by: Timothy Loh <timloh@chromium.org>
Reviewed-by: Rune Lillesveen <futhark@chromium.org>
Commit-Queue: Rob Buis <rob.buis@samsung.com>
Cr-Commit-Position: refs/heads/master@{#543337}

third_party/WebKit/LayoutTests/W3CImportExpectations

@@ -99,7 +99,6 @@ external/wpt/css/vendor-imports/mozilla/mozilla-central-reftests/README [ Skip ]
 external/wpt/css/vendor-imports/mozilla/mozilla-central-reftests/align3 [ Skip ]
 external/wpt/css/vendor-imports/mozilla/mozilla-central-reftests/background [ Skip ]
 external/wpt/css/vendor-imports/mozilla/mozilla-central-reftests/check-for-references.sh [ Skip ]
-external/wpt/css/vendor-imports/mozilla/mozilla-central-reftests/color4 [ Skip ]
 external/wpt/css/vendor-imports/mozilla/mozilla-central-reftests/conditional3 [ Skip ]
 external/wpt/css/vendor-imports/mozilla/mozilla-central-reftests/contain [ Skip ]
 external/wpt/css/vendor-imports/mozilla/mozilla-central-reftests/css21 [ Skip ]

third_party/WebKit/LayoutTests/svg/dom/rgb-color-parser-expected.txt

@@ -86,7 +86,7 @@ Failed to parse: rgb((
 Failed to parse: rgb(88
 Failed to parse: rgb(9.43,(6.87 -
 Failed to parse: rgb(e)e. 5997
-Failed to parse: rgb(5 9-557
+Parsed as rgb(5, 9, 0): rgb(5 9-557
 Failed to parse: rgb((65-%-0,e217
 Failed to parse: rgb( 2
 Failed to parse: rgb((e
@@ -185,7 +185,7 @@ Failed to parse: rgb((
 Failed to parse: rgb(88
 Failed to parse: rgb(9.43,(6.87 -
 Failed to parse: rgb(e)e. 5997
-Failed to parse: rgb(5 9-557
+Parsed as rgb(5, 9, 0): rgb(5 9-557
 Failed to parse: rgb((65-%-0,e217
 Failed to parse: rgb( 2
 Failed to parse: rgb((e

third_party/WebKit/Source/core/css/parser/CSSPropertyParserHelpers.cpp

@@ -566,8 +566,7 @@ static bool ParseRGBParameters(CSSParserTokenRange& range, RGBA32& result) {
       if (i != 1 && !requires_commas)
         return false;
       requires_commas = true;
-    } else if (requires_commas || args.AtEnd() ||
-               (&args.Peek() - 1)->GetType() != kWhitespaceToken) {
+    } else if (requires_commas || args.AtEnd()) {
       return false;
     }
     color_parameter = is_percent ? ConsumePercent(args, kValueRangeAll)
@@ -624,8 +623,7 @@ static bool ParseHSLParameters(CSSParserTokenRange& range, RGBA32& result) {
       if (i != 1 && !requires_commas)
         return false;
       requires_commas = true;
-    } else if (requires_commas || args.AtEnd() ||
-               (&args.Peek() - 1)->GetType() != kWhitespaceToken) {
+    } else if (requires_commas || args.AtEnd()) {
       return false;
     }
     hsl_value = ConsumePercent(args, kValueRangeAll);