Web Animations API: Bindings for TimedItem.specified with readonly attributes

Source/platform/animation/TimingFunction.h

Index: Source/platform/animation/TimingFunction.h
diff --git a/Source/platform/animation/TimingFunction.h b/Source/platform/animation/TimingFunction.h
index 1187ea92f69b811496dbed32c149117ef8fe0f16..dc1bd98465d493b6e2632f451d6da087de3f4c31 100644
--- a/Source/platform/animation/TimingFunction.h
+++ b/Source/platform/animation/TimingFunction.h
@@ -34,6 +34,8 @@
 #include "wtf/RefCounted.h"
 #include "wtf/StdLibExtras.h"
 #include "wtf/Vector.h"
+#include "wtf/text/StringBuilder.h"
+#include "wtf/text/WTFString.h"
 #include <algorithm>
 
 
@@ -50,6 +52,8 @@ public:
 
     Type type() const { return m_type; }
 
+    virtual String toString() const { return ""; }
+
     // Evaluates the timing function at the given fraction. The accuracy parameter provides a hint as to the required
     // accuracy and is not guaranteed.
     virtual double evaluate(double fraction, double accuracy) const = 0;
@@ -73,6 +77,8 @@ public:
 
     virtual ~LinearTimingFunction() { }
 
+    virtual String toString() const OVERRIDE { return "linear"; }
+
     virtual double evaluate(double fraction, double) const OVERRIDE
     {
         ASSERT(RuntimeEnabledFeatures::webAnimationsCSSEnabled() || (fraction >= 0 && fraction <= 1));
@@ -87,7 +93,6 @@ private:
     }
 };
 
-
 // Forward declare so we can friend it below. Don't use in production code!
 class ChainedTimingFunctionTestHelper;
 
@@ -137,6 +142,32 @@ public:
 
     virtual ~CubicBezierTimingFunction() { }
 
+    virtual String toString() const OVERRIDE
+    {
+        switch (this->subType()) {
+        case CubicBezierTimingFunction::Ease:
+            return "ease";
+            break;
+        case CubicBezierTimingFunction::EaseIn:
+            return "ease-in";
+            break;
+        case CubicBezierTimingFunction::EaseOut:
+            return "ease-out";
+            break;
+        case CubicBezierTimingFunction::EaseInOut:
+            return "ease-in-out";
+            break;
+        case CubicBezierTimingFunction::Custom:
+            return "cubic-bezier(" + String::numberToStringECMAScript(this->x1()) + ", " +
+                String::numberToStringECMAScript(this->y1()) + ", " + String::numberToStringECMAScript(this->x2()) +
+                ", " + String::numberToStringECMAScript(this->y2()) + ")";
+            break;
+        default:
+            ASSERT_NOT_REACHED();
+        }
+        return "";
+    }
+
     virtual double evaluate(double fraction, double accuracy) const OVERRIDE
     {
         ASSERT(RuntimeEnabledFeatures::webAnimationsCSSEnabled() || (fraction >= 0 && fraction <= 1));
@@ -207,6 +238,27 @@ public:
 
     virtual ~StepsTimingFunction() { }
 
+    virtual String toString() const OVERRIDE
+    {
+        StringBuilder builder;
+        switch (this->subType()) {
+        case StepsTimingFunction::Start:
+            return "step-start";
+            break;
+        case StepsTimingFunction::End:
+            return "step-end";
+            break;
+        case StepsTimingFunction::Custom:
+            builder.append("steps(" + String::numberToStringECMAScript(this->numberOfSteps()) + ", ");
+            builder.append(this->stepAtStart() ? "start" : "end");
+            builder.append(")");
+            break;
+        default:
+            ASSERT_NOT_REACHED();
+        }
+        return builder.toString();
+    }
+
     virtual double evaluate(double fraction, double) const OVERRIDE
     {
         ASSERT(RuntimeEnabledFeatures::webAnimationsCSSEnabled() || (fraction >= 0 && fraction <= 1));
@@ -246,6 +298,23 @@ public:
         ASSERT(upperBound > max);
         m_segments.append(Segment(max, upperBound, timingFunction));
     }
+
+    virtual String toString() const OVERRIDE
+    {
+        StringBuilder builder;
+        builder.append("chained(");
+        for (size_t i = 0; i < this->m_segments.size(); i++) {
+            ChainedTimingFunction::Segment segment = this->m_segments[i];
+            builder.append(segment.m_timingFunction->toString());
+            builder.append("[" + String::numberToStringECMAScript(segment.m_min) + " -> " + String::numberToStringECMAScript(segment.m_max) + "]");
+            if (i+1 != this->m_segments.size()) {
+                builder.append(", ");
+            }
+        }
+        builder.append(")");
+        return builder.toString();
+    }
+
     virtual double evaluate(double fraction, double accuracy) const OVERRIDE
     {
         ASSERT_WITH_MESSAGE(fraction >= 0 && fraction <= 1, "Web Animations not yet implemented: Timing function behavior outside the range [0, 1] is not yet specified");
@@ -292,6 +361,7 @@ private:
         // Allow PrintTo/operator== of the segments. Can be removed once
         // ChainedTimingFunction has a public API for segments.
         friend class ChainedTimingFunctionTestHelper;
+        friend class ChainedTimingFunction;
     };
 
     ChainedTimingFunction()