Web Animations: Allow timing inputs outside the range [0, 1]

Source/platform/animation/UnitBezierTest.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:
  * 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
  *     notice, this list of conditions and the following disclaimer in the
@@ skipping 42 matching lines @@
 TEST(UnitBezierTest, InputAtEdgeOfRange)
 {
     UnitBezier bezier(0.5, 1.0, 0.5, 1.0);
     EXPECT_EQ(0.0, bezier.solve(0.0, 0.005));
     EXPECT_EQ(1.0, bezier.solve(1.0, 0.005));
 }
 
 TEST(UnitBezierTest, InputOutOfRange)
 {
     UnitBezier bezier(0.5, 1.0, 0.5, 1.0);
-    EXPECT_EQ(0.0, bezier.solve(-1.0, 0.005));
+    EXPECT_EQ(-2.0, bezier.solve(-1.0, 0.005));
     EXPECT_EQ(1.0, bezier.solve(2.0, 0.005));
 }
 
 TEST(UnitBezierTest, InputOutOfRangeLargeEpsilon)
 {
     UnitBezier bezier(0.5, 1.0, 0.5, 1.0);
-    EXPECT_EQ(0.0, bezier.solve(-1.0, 1.0));
+    EXPECT_EQ(-2.0, bezier.solve(-1.0, 1.0));
     EXPECT_EQ(1.0, bezier.solve(2.0, 1.0));
 }
 
+TEST(UnitBezierTest, InputOutOfRangeCoincidentEndpoints)
+{
+    UnitBezier bezier(0.0, 0.0, 1.0, 1.0);
+    EXPECT_EQ(-1.0, bezier.solve(-1.0, 0.005));
+    EXPECT_EQ(2.0, bezier.solve(2.0, 0.005));
+}
+
+TEST(UnitBezierTest, InputOutOfRangeVerticalGradient)
+{
+    UnitBezier bezier(0.0, 1.0, 1.0, 0.0);
+    EXPECT_EQ(0.0, bezier.solve(-1.0, 0.005));
+    EXPECT_EQ(1.0, bezier.solve(2.0, 0.005));
+}
+
+TEST(UnitBezierTest, InputOutOfRangeDistinctEndpoints)
+{
+    UnitBezier bezier(0.1, 0.2, 0.8, 0.8);
+    EXPECT_EQ(-2.0, bezier.solve(-1.0, 0.005));
+    EXPECT_EQ(2.0, bezier.solve(2.0, 0.005));
+}
+
 } // namespace