[Tracing] Make heap profiler type info a string

base/trace_event/memory_dump_manager.cc

 // 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.
 
 #include "base/trace_event/memory_dump_manager.h"
 
 #include <algorithm>
 #include <utility>
 
 #include "base/atomic_sequence_num.h"
 #include "base/base_switches.h"
 #include "base/command_line.h"
 #include "base/compiler_specific.h"
 #include "base/thread_task_runner_handle.h"
 #include "base/threading/thread.h"
 #include "base/trace_event/heap_profiler_allocation_context_tracker.h"
 #include "base/trace_event/heap_profiler_stack_frame_deduplicator.h"
+#include "base/trace_event/heap_profiler_type_name_deduplicator.h"
 #include "base/trace_event/malloc_dump_provider.h"
 #include "base/trace_event/memory_dump_provider.h"
 #include "base/trace_event/memory_dump_session_state.h"
 #include "base/trace_event/process_memory_dump.h"
 #include "base/trace_event/trace_event_argument.h"
 #include "build/build_config.h"
 
 #if !defined(OS_NACL)
 #include "base/trace_event/process_memory_totals_dump_provider.h"
 #endif
@@ skipping 484 matching lines @@
   if (!dump_thread->Start()) {
     LOG(ERROR) << "Failed to start the memory-infra thread for tracing";
     return;
   }
 
   AutoLock lock(lock_);
 
   DCHECK(delegate_);  // At this point we must have a delegate.
 
   scoped_refptr<StackFrameDeduplicator> stack_frame_deduplicator = nullptr;
+  scoped_refptr<TypeNameDeduplicator> type_name_deduplicator = nullptr;
 
   if (heap_profiling_enabled_) {
-    // If heap profiling is enabled, the stack frame deduplicator will be in
-    // use. Add a metadata event to write its frames.
+    // If heap profiling is enabled, the stack frame deduplicator and type name
+    // deduplicator will be in use. Add a metadata events to write the frames
+    // and type IDs.
     stack_frame_deduplicator = new StackFrameDeduplicator;
+    type_name_deduplicator = new TypeNameDeduplicator;
     TRACE_EVENT_API_ADD_METADATA_EVENT(
         "stackFrames", "stackFrames",
         scoped_refptr<ConvertableToTraceFormat>(stack_frame_deduplicator));
+    TRACE_EVENT_API_ADD_METADATA_EVENT(
+        "typeNames", "typeNames",
+        scoped_refptr<ConvertableToTraceFormat>(type_name_deduplicator));
   }
 
   DCHECK(!dump_thread_);
   dump_thread_ = std::move(dump_thread);
-  session_state_ = new MemoryDumpSessionState(stack_frame_deduplicator);
+  session_state_ = new MemoryDumpSessionState(stack_frame_deduplicator,
+                                              type_name_deduplicator);
 
   for (auto it = dump_providers_.begin(); it != dump_providers_.end(); ++it) {
     it->disabled = false;
     it->consecutive_failures = 0;
   }
 
   subtle::NoBarrier_Store(&memory_tracing_enabled_, 1);
 
   // TODO(primiano): This is a temporary hack to disable periodic memory dumps
   // when running memory benchmarks until telemetry uses TraceConfig to
@@ skipping 101 matching lines @@
   auto iter = process_dumps.find(pid);
   if (iter == process_dumps.end()) {
     scoped_ptr<ProcessMemoryDump> new_pmd(new ProcessMemoryDump(session_state));
     iter = process_dumps.insert(pid, std::move(new_pmd)).first;
   }
   return iter->second;
 }
 
 }  // namespace trace_event
 }  // namespace base