Add the reason in heap profiler dumps.

third_party/tcmalloc/chromium/src/deep-heap-profile.cc

 // Copyright (c) 2012 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.
 
 // ---
 // Author: Sainbayar Sukhbaatar
 //         Dai Mikurube
 //
 
 #include "deep-heap-profile.h"
@@ skipping 211 matching lines @@
 }
 
 DeepHeapProfile::~DeepHeapProfile() {
   heap_profile_->dealloc_(profiler_buffer_);
   heap_profile_->dealloc_(filename_prefix_);
   delete memory_residence_info_getter_;
 }
 
 // Global malloc() should not be used in this function.
 // Use LowLevelAlloc if required.
-int DeepHeapProfile::FillOrderedProfile(char raw_buffer[], int buffer_size) {
+int DeepHeapProfile::FillOrderedProfile(char raw_buffer[],
+                                        int buffer_size,
+                                        const char* reason) {
   TextBuffer buffer(raw_buffer, buffer_size);
   TextBuffer global_buffer(profiler_buffer_, kProfilerBufferSize);
 
 #ifndef NDEBUG
   int64 starting_cycles = CycleClock::Now();
 #endif
 
   // Get the time before starting snapshot.
   // TODO(dmikurube): Consider gettimeofday if available.
   time_t time_value = time(NULL);
@@ skipping 25 matching lines @@
   buffer.AppendString(kProfileVersion, 0);
   buffer.AppendString("\n", 0);
 
   // Fill buffer with meta information.
   buffer.AppendString(kMetaInformationHeader, 0);
 
   buffer.AppendString("Time: ", 0);
   buffer.AppendUnsignedLong(time_value, 0);
   buffer.AppendChar('\n');
 
+  if (reason != NULL) {
+    buffer.AppendString("Reason: ", 0);
+    buffer.AppendString(reason, 0);
+    buffer.AppendChar('\n');
+  }
+
   // Fill buffer with the global stats.
   buffer.AppendString(kMMapListHeader, 0);
 
   stats_.SnapshotMaps(memory_residence_info_getter_, this, &buffer);
 
   // Fill buffer with the global stats.
   buffer.AppendString(kGlobalStatsHeader, 0);
 
   stats_.Unparse(&buffer);
 
@@ skipping 670 matching lines @@
 }
 
 DeepHeapProfile::~DeepHeapProfile() {
 }
 
 int DeepHeapProfile::FillOrderedProfile(char raw_buffer[], int buffer_size) {
   return heap_profile_->FillOrderedProfile(raw_buffer, buffer_size);
 }
 
 #endif  // USE_DEEP_HEAP_PROFILE