Added support of calc() for SVGLength

third_party/WebKit/Source/core/animation/SVGLengthInterpolationType.cpp

Index: third_party/WebKit/Source/core/animation/SVGLengthInterpolationType.cpp
diff --git a/third_party/WebKit/Source/core/animation/SVGLengthInterpolationType.cpp b/third_party/WebKit/Source/core/animation/SVGLengthInterpolationType.cpp
index 29b6bf2e67ec83eb4032dca12989053576860714..b870c60f80302cfbee3cbb0058823d95f4da8048 100644
--- a/third_party/WebKit/Source/core/animation/SVGLengthInterpolationType.cpp
+++ b/third_party/WebKit/Source/core/animation/SVGLengthInterpolationType.cpp
@@ -103,11 +103,18 @@ std::unique_ptr<InterpolableValue> SVGLengthInterpolationType::neutralInterpolab
 
 InterpolationValue SVGLengthInterpolationType::convertSVGLength(const SVGLength& length)
 {
-    double value = length.valueInSpecifiedUnits();
-    LengthInterpolatedUnit unitType = convertToInterpolatedUnit(length.typeWithCalcResolved(), value);
+    const CSSPrimitiveValue* primitiveValue = length.asCSSPrimitiveValue();
+
+    CSSLengthArray lengthArray;
+    primitiveValue->accumulateLengthArray(lengthArray);
 
     double values[numLengthInterpolatedUnits] = { };
-    values[unitType] = value;
+
+    for (size_t i = 0; i < CSSPrimitiveValue::LengthUnitTypeCount; i++) {
+        double value = lengthArray.values[i];
+        LengthInterpolatedUnit unitType = convertToInterpolatedUnit(SVGLength::toUnitType(i), value);

[fs, 2016/07/16 21:13:02]

Couldn't we take this opportunity to transition to LengthUnitType from
CSSPrimitiveValue? (And potentially gain 'ch' support as well?) Then I think
this loop would fold with the loop below, and all the remapping code would go
away.

[Shanmuga Pandi, 2016/07/18 13:35:32]

That's good thought.. :)
Done!!

[fs, 2016/07/18 13:56:48]

Looks great, thanks!

+        values[unitType] = value;
+    }
 
     std::unique_ptr<InterpolableList> listOfValues = InterpolableList::create(numLengthInterpolatedUnits);
     for (size_t i = 0; i < numLengthInterpolatedUnits; ++i)