Bug fix - rem & ch in MQs/sizes treated as unknown units

Source/core/css/parser/SizesAttributeParserTest.cpp

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "config.h"
 #include "core/css/parser/SizesAttributeParser.h"
 
 #include "core/MediaTypeNames.h"
 #include "core/css/MediaValuesCached.h"
 
@@ skipping 28 matching lines @@
         {" /**/ 300px", 300},
         {"300px /**/ ", 300},
         {" /**/ (min-width:500px) /**/ 300px", 300},
         {"-100px, 200px", 200},
         {"-50vw, 20vw", 100},
         {"50asdf, 200px", 200},
         {"asdf, 200px", 200},
         {"(max-width: 3000px) 200w, 400w", 500},
         {",, , /**/ ,200px", 200},
         {"50vw", 250},
+        {"5em", 80},
+        {"5rem", 80},
         {"calc(40vw*2)", 400},
         {"(min-width:5000px) calc(5000px/10), (min-width:500px) calc(1200px/3)", 400},
         {"(min-width:500px) calc(1200/3)", 500},
         {"(min-width:500px) calc(1200px/(0px*14))", 500},
         {"(max-width: 3000px) 200px, 400px", 200},
         {"(max-width: 3000px) 20em, 40em", 320},
         {"(max-width: 3000px) 0, 40em", 0},
         {"(max-width: 3000px) 50vw, 40em", 250},
         {0, 0} // Do not remove the terminator line.
     };
@@ skipping 13 matching lines @@
     data.strictMode = true;
     RefPtr<MediaValues> mediaValues = MediaValuesCached::create(data);
 
     for (unsigned i = 0; testCases[i].input; ++i) {
         int effectiveSize = SizesAttributeParser::findEffectiveSize(testCases[i].input, mediaValues);
         ASSERT_EQ(testCases[i].output, effectiveSize);
     }
 }
 
 } // namespace