Update from https://crrev.com/333737

base/trace_event/malloc_dump_provider.h

Index: base/trace_event/malloc_dump_provider.h
diff --git a/base/trace_event/malloc_dump_provider.h b/base/trace_event/malloc_dump_provider.h
index ec8683a2e200a1a6f192ddefe6079cd1f5a30940..0a51ff75daafbbe5a947b2cbc9958267891e67a6 100644
--- a/base/trace_event/malloc_dump_provider.h
+++ b/base/trace_event/malloc_dump_provider.h
@@ -16,6 +16,10 @@ namespace trace_event {
 // Dump provider which collects process-wide memory stats.
 class BASE_EXPORT MallocDumpProvider : public MemoryDumpProvider {
  public:
+  // Name of the allocated_objects dump. Use this to declare suballocator dumps
+  // from other dump providers.
+  static const char kAllocatedObjects[];
+
   static MallocDumpProvider* GetInstance();
 
   // MemoryDumpProvider implementation.