Rename and improve "traceable" templates.

third_party/WebKit/Source/wtf/VectorTraits.h

 /*
  * Copyright (C) 2006, 2007, 2008 Apple Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
  * This library is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
@@ skipping 30 matching lines @@
     // destructor can be invoked over. The zero'ed value representing an unused
     // slot in the vector's backing storage; it does not have to be equal to
     // what its constructor(s) would create, only be valid for those two uses.
     static const bool canClearUnusedSlotsWithMemset = IsTriviallyDefaultConstructible<T>::value;
 
     static const bool canMoveWithMemcpy = IsTriviallyMoveAssignable<T>::value;
     static const bool canCopyWithMemcpy = IsTriviallyCopyAssignable<T>::value;
     static const bool canFillWithMemset = IsTriviallyDefaultConstructible<T>::value && (sizeof(T) == sizeof(char));
     static const bool canCompareWithMemcmp = std::is_scalar<T>::value; // Types without padding.
     template <typename U = void>
-    struct NeedsTracingLazily {
-        static const bool value = NeedsTracing<T>::value;
+    struct IsTraceableInCollection {
+        static const bool value = IsTraceable<T>::value;
     };
     static const WeakHandlingFlag weakHandlingFlag = NoWeakHandlingInCollections; // We don't support weak handling in vectors.
 };
 
 template <typename T>
 struct VectorTraits : VectorTraitsBase<T> {};
 
 // Classes marked with SimpleVectorTraits will use memmov, memcpy, memcmp
 // instead of constructors, copy operators, etc for initialization, move and
 // comparison.
@@ skipping 29 matching lines @@
     typedef VectorTraits<Second> SecondTraits;
 
     static const bool needsDestruction = FirstTraits::needsDestruction || SecondTraits::needsDestruction;
     static const bool canInitializeWithMemset = FirstTraits::canInitializeWithMemset && SecondTraits::canInitializeWithMemset;
     static const bool canMoveWithMemcpy = FirstTraits::canMoveWithMemcpy && SecondTraits::canMoveWithMemcpy;
     static const bool canCopyWithMemcpy = FirstTraits::canCopyWithMemcpy && SecondTraits::canCopyWithMemcpy;
     static const bool canFillWithMemset = false;
     static const bool canCompareWithMemcmp = FirstTraits::canCompareWithMemcmp && SecondTraits::canCompareWithMemcmp;
     static const bool canClearUnusedSlotsWithMemset = FirstTraits::canClearUnusedSlotsWithMemset && SecondTraits::canClearUnusedSlotsWithMemset;
     template <typename U = void>
-        struct NeedsTracingLazily {
-        static const bool value = NeedsTracingTrait<FirstTraits>::value || NeedsTracingTrait<SecondTraits>::value;
+    struct IsTraceableInCollection {
+        static const bool value = IsTraceableInCollectionTrait<FirstTraits>::value || IsTraceableInCollectionTrait<SecondTraits>::value;
     };
     static const WeakHandlingFlag weakHandlingFlag = NoWeakHandlingInCollections; // We don't support weak handling in vectors.
 };
 
 } // namespace WTF
 
 #define WTF_ALLOW_MOVE_INIT_AND_COMPARE_WITH_MEM_FUNCTIONS(ClassName) \
 namespace WTF { \
 static_assert(!IsTriviallyDefaultConstructible<ClassName>::value || !IsTriviallyMoveAssignable<ClassName>::value || !std::is_scalar<ClassName>::value, "macro not needed"); \
 template <> \
@@ skipping 30 matching lines @@
 struct VectorTraits<ClassName> : VectorTraitsBase<ClassName> \
 { \
     static const bool canClearUnusedSlotsWithMemset = true; \
 }; \
 }
 
 using WTF::VectorTraits;
 using WTF::SimpleClassVectorTraits;
 
 #endif // WTF_VectorTraits_h