Add debug info for field trial allocation crash

base/metrics/field_trial.h

 // 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.
 
 // FieldTrial is a class for handling details of statistical experiments
 // performed by actual users in the field (i.e., in a shipped or beta product).
 // All code is called exclusively on the UI thread currently.
 //
 // The simplest example is an experiment to see whether one of two options
 // produces "better" results across our user population.  In that scenario, UMA
@@ skipping 66 matching lines @@
 #include "base/time/time.h"
 
 namespace base {
 
 class FieldTrialList;
 
 class BASE_EXPORT FieldTrial : public RefCounted<FieldTrial> {
  public:
   typedef int Probability;  // Probability type for being selected in a trial.
 
+  // TODO(665129): Make private again after crash has been resolved.
+  typedef SharedPersistentMemoryAllocator::Reference FieldTrialRef;
+
   // Specifies the persistence of the field trial group choice.
   enum RandomizationType {
     // One time randomized trials will persist the group choice between
     // restarts, which is recommended for most trials, especially those that
     // change user visible behavior.
     ONE_TIME_RANDOMIZED,
     // Session randomized trials will roll the dice to select a group on every
     // process restart.
     SESSION_RANDOMIZED,
   };
@@ skipping 115 matching lines @@
   FRIEND_TEST_ALL_PREFIXES(FieldTrialTest, Save);
   FRIEND_TEST_ALL_PREFIXES(FieldTrialTest, SaveAll);
   FRIEND_TEST_ALL_PREFIXES(FieldTrialTest, DuplicateRestore);
   FRIEND_TEST_ALL_PREFIXES(FieldTrialTest, SetForcedTurnFeatureOff);
   FRIEND_TEST_ALL_PREFIXES(FieldTrialTest, SetForcedTurnFeatureOn);
   FRIEND_TEST_ALL_PREFIXES(FieldTrialTest, SetForcedChangeDefault_Default);
   FRIEND_TEST_ALL_PREFIXES(FieldTrialTest, SetForcedChangeDefault_NonDefault);
   FRIEND_TEST_ALL_PREFIXES(FieldTrialTest, FloatBoundariesGiveEqualGroupSizes);
   FRIEND_TEST_ALL_PREFIXES(FieldTrialTest, DoesNotSurpassTotalProbability);
 
-  typedef SharedPersistentMemoryAllocator::Reference FieldTrialRef;
-
   friend class base::FieldTrialList;
 
   friend class RefCounted<FieldTrial>;
 
   // This is the group number of the 'default' group when a choice wasn't forced
   // by a call to FieldTrialList::CreateFieldTrial. It is kept private so that
   // consumers don't use it by mistake in cases where the group was forced.
   static const int kDefaultGroupNumber;
 
   // Creates a field trial with the specified parameters. Group assignment will
@@ skipping 386 matching lines @@
   // AppendFieldTrialHandleIfNeeded().
   HANDLE readonly_allocator_handle_ = nullptr;
 #endif
 
   DISALLOW_COPY_AND_ASSIGN(FieldTrialList);
 };
 
 }  // namespace base
 
 #endif  // BASE_METRICS_FIELD_TRIAL_H_