Oilpan: Move AnimatableValue's hierarchy to oilpan's heap

Source/core/animation/AnimatableValueTestHelperTest.cpp

Index: Source/core/animation/AnimatableValueTestHelperTest.cpp
diff --git a/Source/core/animation/AnimatableValueTestHelperTest.cpp b/Source/core/animation/AnimatableValueTestHelperTest.cpp
index d7f98ca3d0aaa2c06d6a99e14c6d375e3068be40..ef23fddf29b7491b4c2e9928dd26ace53cc8bda7 100644
--- a/Source/core/animation/AnimatableValueTestHelperTest.cpp
+++ b/Source/core/animation/AnimatableValueTestHelperTest.cpp
@@ -50,15 +50,10 @@ namespace {
 
 class AnimationAnimatableValueTestHelperTest : public ::testing::Test {
 protected:
-    ::std::string PrintToString(PassRefPtr<AnimatableValue> animValue)
+    ::std::string PrintToString(PassRefPtrWillBeRawPtr<AnimatableValue> animValue)
     {
         return PrintToString(animValue.get());
     }
-
-    ::std::string PrintToString(const AnimatableValue* animValue)
-    {
-        return ::testing::PrintToString(*animValue);
-    }
 };
 
 TEST_F(AnimationAnimatableValueTestHelperTest, PrintTo)
@@ -104,10 +99,10 @@ TEST_F(AnimationAnimatableValueTestHelperTest, PrintTo)
             )));
 
     EXPECT_THAT(
-        PrintToString(AnimatableValue::neutralValue()),
+        PrintToString(const_cast<AnimatableValue*>(AnimatableValue::neutralValue())),

[haraken, 2014/03/21 17:21:33]

I think you're talking about this const_cast, but I'd like to keep this
const_cast. This is a bit complicated.

If I keep both PrintToString(PassRefPtrWillBeRawPtr<AnimatableValue> animValue)
and PrintToString(const AnimatableValue* animValue), I hit a compile error when
calling PrintToString(foo()) where foo() returns a const raw pointer of a
sub-class of AnimatableValue, because the const raw pointer can be converted
into both RawPtr<AnimatableValue> and const AnimatableValue*.

I tried a couple of approaches to make it compilable in both oilpan build and
non-oilpan build, and the simplest approach I found was to remove
PrintToString(const AnimatableValue* animValue) and use const_cast here.

         testing::StartsWith("AnimatableNeutral@"));
 
-    Vector<RefPtr<AnimatableValue> > v1;
+    WillBeHeapVector<RefPtrWillBeMember<AnimatableValue> > v1;
     v1.append(AnimatableLength::create(CSSPrimitiveValue::create(3, CSSPrimitiveValue::CSS_REMS).get()));
     v1.append(AnimatableLength::create(CSSPrimitiveValue::create(4, CSSPrimitiveValue::CSS_PT).get()));
     EXPECT_EQ(