TimingFunction test helper.

Source/core/platform/animation/TimingFunction.h

Index: Source/core/platform/animation/TimingFunction.h
diff --git a/Source/core/platform/animation/TimingFunction.h b/Source/core/platform/animation/TimingFunction.h
index 342925772719f6112f7767545cc02fe44402e40d..e2c33bebe05708b203937a652354886b817b8719 100644
--- a/Source/core/platform/animation/TimingFunction.h
+++ b/Source/core/platform/animation/TimingFunction.h
@@ -35,6 +35,7 @@
 #include "wtf/Vector.h"
 #include <algorithm>
 
+
 namespace WebCore {
 
 class TimingFunction : public RefCounted<TimingFunction> {
@@ -91,6 +92,10 @@ private:
     }
 };
 
+
+// Forward declare so we can friend it below. Don't use in production code!
+class ChainedTimingFunctionPrinter;
+
 class CubicBezierTimingFunction : public TimingFunction {
 public:
     enum SubType {
@@ -311,6 +316,10 @@ private:
         double m_min;
         double m_max;
         RefPtr<TimingFunction> m_timingFunction;
+
+        // Allow printing of our segments. Can be removed once
+        // ChainedTimingFunction has a public API for segments.
+        friend class ChainedTimingFunctionPrinter;
     };
 
     ChainedTimingFunction()
@@ -320,6 +329,10 @@ private:
     }
 
     Vector<Segment> m_segments;
+
+    // Allow printing of our segments. Can be removed once
+    // ChainedTimingFunction has a public API for segments.
+    friend class ChainedTimingFunctionPrinter;
 };
 
 } // namespace WebCore