Web Animations API: Implement step-middle and steps(x, middle) timing functions.

Source/platform/animation/TimingFunctionTestHelper.cpp

 /*
  * Copyright (c) 2013, 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 116 matching lines @@
     *os << ")";
 }
 
 void PrintTo(const StepsTimingFunction& timingFunction, ::std::ostream* os)
 {
     *os << "StepsTimingFunction@" << &timingFunction << "(";
     switch (timingFunction.subType()) {
     case StepsTimingFunction::Start:
         *os << "Start";
         break;
+    case StepsTimingFunction::Middle:
+        *os << "Middle";
+        break;
     case StepsTimingFunction::End:
         *os << "End";
         break;
     case StepsTimingFunction::Custom:
         *os << "Custom";
         break;
     default:
         ASSERT_NOT_REACHED();
     }
     *os << ", " << timingFunction.numberOfSteps();
-    *os << ", " << (timingFunction.stepAtStart() ? "true" : "false");
+    *os << ", ";
+
+    switch (timingFunction.stepAtPosition()) {
+    case StepsTimingFunction::StepAtStart:
+        *os << "StepAtStart";
+        break;
+    case StepsTimingFunction::StepAtMiddle:
+        *os << "StepAtMiddle";
+        break;
+    case StepsTimingFunction::StepAtEnd:
+        *os << "StepAtEnd";
+        break;
+    default:
+        ASSERT_NOT_REACHED();
+    }
     *os << ")";
 }
 
 void PrintTo(const ChainedTimingFunction& timingFunction, ::std::ostream* os)
 {
     ChainedTimingFunctionTestHelper::PrintTo(timingFunction, os);
 }
 
 // The generic PrintTo *must* come after the non-generic PrintTo otherwise it
 // will end up calling itself.
@@ skipping 42 matching lines @@
     return lhs.subType() == ctf.subType();
 }
 
 bool operator==(const StepsTimingFunction& lhs, const TimingFunction& rhs)
 {
     if (rhs.type() != TimingFunction::StepsFunction)
         return false;
 
     const StepsTimingFunction& stf = toStepsTimingFunction(rhs);
     if ((lhs.subType() == StepsTimingFunction::Custom) && (stf.subType() == StepsTimingFunction::Custom))
-        return (lhs.numberOfSteps() == stf.numberOfSteps()) && (lhs.stepAtStart() == stf.stepAtStart());
+        return (lhs.numberOfSteps() == stf.numberOfSteps()) && (lhs.stepAtPosition() == stf.stepAtPosition());
 
     return lhs.subType() == stf.subType();
 }
 
 bool operator==(const ChainedTimingFunction& lhs, const TimingFunction& rhs)
 {
     return ChainedTimingFunctionTestHelper::equals(lhs, rhs);
 }
 
 // Like in the PrintTo case, the generic operator== *must* come after the
@@ skipping 23 matching lines @@
     return false;
 }
 
 // No need to define specific operator!= as they can all come via this function.
 bool operator!=(const TimingFunction& lhs, const TimingFunction& rhs)
 {
     return !(lhs == rhs);
 }
 
 } // namespace WebCore