Add dump name for tracing in PartitionAlloc for sub-allocations

third_party/WebKit/Source/wtf/Partitions.h

Index: third_party/WebKit/Source/wtf/Partitions.h
diff --git a/third_party/WebKit/Source/wtf/Partitions.h b/third_party/WebKit/Source/wtf/Partitions.h
index 276380472bd64b9e5beed85d8c9c172309b45d2d..9db0be8bc8e7d982e3eb501689984c9948688c55 100644
--- a/third_party/WebKit/Source/wtf/Partitions.h
+++ b/third_party/WebKit/Source/wtf/Partitions.h
@@ -39,6 +39,10 @@ namespace WTF {
 
 class WTF_EXPORT Partitions {
 public:
+    // Name of allocator used by tracing for marking sub-allocations while take
+    // memory snapshots.
+    static const char* const kAllocatedObjectPoolName;
+
     static void initialize();
     // TODO(bashi): Remove this function and make initialize() take
     // HistogramEnumerationFunction when we can make sure that WTF::initialize()