[PartitionAlloc] Annotate common Blink types for heap profiling

third_party/WebKit/Source/wtf/PartitionAllocator.h

Index: third_party/WebKit/Source/wtf/PartitionAllocator.h
diff --git a/third_party/WebKit/Source/wtf/PartitionAllocator.h b/third_party/WebKit/Source/wtf/PartitionAllocator.h
index 08f0f43c9922fde6685e50d8b6c7c9807c6f3a57..29cf027434f276a576254df17c5bfd54eb4defbb 100644
--- a/third_party/WebKit/Source/wtf/PartitionAllocator.h
+++ b/third_party/WebKit/Source/wtf/PartitionAllocator.h
@@ -194,6 +194,11 @@ public:
     }
 };
 
+// Specializations for heap profiling, so type profiling of |char| is possible
+// even in official builds (because |char| makes up a large portion of the heap.)
+template <> char* PartitionAllocator::allocateVectorBacking<char>(size_t size);
+template <> char* PartitionAllocator::allocateExpandedVectorBacking<char>(size_t size);
+
 } // namespace WTF
 
 #define WTF_USE_ALLOCATOR(ClassName, Allocator) \