Add CSS conic-gradient calc() support

third_party/WebKit/Source/core/css/CSSGradientValue.cpp

 /*
  * Copyright (C) 2008 Apple Inc.  All rights reserved.
  * Copyright (C) 2015 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
@@ skipping 579 matching lines @@
       } else if (stop.offset_->IsLength() ||
                  stop.offset_->IsCalculatedPercentageWithLength()) {
         float length;
         if (stop.offset_->IsLength())
           length = stop.offset_->ComputeLength<float>(conversion_data);
         else
           length = stop.offset_->CssCalcValue()
                        ->ToCalcValue(conversion_data)
                        ->Evaluate(gradient_length);
         stops[i].offset = (gradient_length > 0) ? length / gradient_length : 0;
-      } else if (stop.offset_->IsAngle()) {
+      } else if (CSSPrimitiveValue::IsAngle(
+                     stop.offset_->TypeWithCalcResolved())) {
         stops[i].offset = stop.offset_->ComputeDegrees() / 360.0f;
       } else {
         NOTREACHED();
         stops[i].offset = 0;
       }
       stops[i].specified = true;
     } else {
       // If the first color-stop does not have a position, its position defaults
       // to 0%. If the last color-stop does not have a position, its position
       // defaults to 100%.
@@ skipping 912 matching lines @@
          DataEquivalent(from_angle_, other.from_angle_) &&
          stops_ == other.stops_;
 }
 
 DEFINE_TRACE_AFTER_DISPATCH(CSSConicGradientValue) {
   visitor->Trace(from_angle_);
   CSSGradientValue::TraceAfterDispatch(visitor);
 }
 
 }  // namespace blink