Improve DEFINE_STATIC_LOCAL()'s handling of Blink GCed objects.

third_party/WebKit/Source/platform/heap/HeapTest.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 6491 matching lines @@
 
     EXPECT_EQ(1u, vector2.size());
 // TODO(Oilpan): when Vector.h's contiguous container support no longer disables
 // Vector<>s with inline capacity, remove.
 #if !defined(ANNOTATE_CONTIGUOUS_CONTAINER)
     EXPECT_EQ(16u, vector1.capacity());
     EXPECT_EQ(16u, vector2.capacity());
 #endif
 }
 
+TEST(HeapTest, TestStaticLocals)
+{
+    // Sanity check DEFINE_STATIC_LOCAL()s over heap allocated objects and collections.
+
+    DEFINE_STATIC_LOCAL(IntWrapper, intWrapper, (new IntWrapper(33)));
+    DEFINE_STATIC_LOCAL(PersistentHeapVector<Member<IntWrapper>>, persistentHeapVectorIntWrapper, ());
+    DEFINE_STATIC_LOCAL(HeapVector<Member<IntWrapper>>, heapVectorIntWrapper, (new HeapVector<Member<IntWrapper>>));
+
+    EXPECT_EQ(33, intWrapper.value());
+    EXPECT_EQ(0u, persistentHeapVectorIntWrapper.size());
+    EXPECT_EQ(0u, heapVectorIntWrapper.size());
+
+    persistentHeapVectorIntWrapper.append(&intWrapper);
+    heapVectorIntWrapper.append(&intWrapper);
+    EXPECT_EQ(1u, persistentHeapVectorIntWrapper.size());
+    EXPECT_EQ(1u, heapVectorIntWrapper.size());
+
+    EXPECT_EQ(persistentHeapVectorIntWrapper[0], heapVectorIntWrapper[0]);
+    EXPECT_EQ(33, heapVectorIntWrapper[0]->value());
+}
+
 } // namespace blink