[Tracing] Make heap profiler type info a string

base/trace_event/memory_dump_session_state.h

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef BASE_TRACE_EVENT_MEMORY_DUMP_SESSION_STATE_H_
 #define BASE_TRACE_EVENT_MEMORY_DUMP_SESSION_STATE_H_
 
 #include "base/base_export.h"
 #include "base/memory/ref_counted.h"
 #include "base/trace_event/heap_profiler_stack_frame_deduplicator.h"
+#include "base/trace_event/heap_profiler_type_name_deduplicator.h"
 
 namespace base {
 namespace trace_event {
 
 // Container for state variables that should be shared across all the memory
 // dumps in a tracing session.
 class BASE_EXPORT MemoryDumpSessionState
     : public RefCountedThreadSafe<MemoryDumpSessionState> {
  public:
   MemoryDumpSessionState(
-      const scoped_refptr<StackFrameDeduplicator>& stack_frame_deduplicator);
+      const scoped_refptr<StackFrameDeduplicator>& stack_frame_deduplicator,
+      const scoped_refptr<TypeNameDeduplicator>& type_name_deduplicator);
 
   // Returns the stack frame deduplicator that should be used by memory dump
   // providers when doing a heap dump.
   StackFrameDeduplicator* stack_frame_deduplicator() {
     return stack_frame_deduplicator_.get();
   }
 
+  // Returns the type name deduplicator that should be used by memory dump
+  // providers when doing a heap dump.
+  TypeNameDeduplicator* type_name_deduplicator() {
+    return type_name_deduplicator_.get();
+  }
+
  private:
   friend class RefCountedThreadSafe<MemoryDumpSessionState>;
   ~MemoryDumpSessionState();
 
   // Deduplicates backtraces in heap dumps so they can be written once when the
   // trace is finalized.
   scoped_refptr<StackFrameDeduplicator> stack_frame_deduplicator_;
+
+  // Deduplicates type names in heap dumps so they can be written once when the
+  // trace is finalized.
+  scoped_refptr<TypeNameDeduplicator> type_name_deduplicator_;
 };
 
 }  // namespace trace_event
 }  // namespace base
 
 #endif  // BASE_TRACE_EVENT_MEMORY_DUMP_SESSION_STATE_H_