[tracing] Add test for memory-infra startup tracing

base/trace_event/memory_dump_manager.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_MANAGER_H_
 #define BASE_TRACE_EVENT_MEMORY_DUMP_MANAGER_H_
 
 #include <set>
 
 #include "base/atomicops.h"
@@ skipping 87 matching lines @@
   uint64 GetTracingProcessId() const;
 
   // Returns the name for a the allocated_objects dump. Use this to declare
   // suballocator dumps from other dump providers.
   // It will return nullptr if there is no dump provider for the system
   // allocator registered (which is currently the case for Mac OS).
   const char* system_allocator_pool_name() const {
     return kSystemAllocatorPoolName;
   };
 
-  // Tells the initialization phase to skip scheduling periodic memory dumps.
-  void DisablePeriodicDumpsForTesting() {
-    disable_periodic_dumps_for_testing_ = true;
-  }
-
  private:
   friend struct DefaultDeleter<MemoryDumpManager>;  // For the testing instance.
   friend struct DefaultSingletonTraits<MemoryDumpManager>;
   friend class MemoryDumpManagerDelegate;
   friend class MemoryDumpManagerTest;
 
   // Descriptor struct used to hold information about registered MDPs. It is
   // deliberately copyable, in order to allow it to be used as std::set value.
   struct MemoryDumpProviderInfo {
     MemoryDumpProviderInfo(
@@ skipping 103 matching lines @@
   // For time-triggered periodic dumps.
   RepeatingTimer<MemoryDumpManager> periodic_dump_timer_;
 
   // The unique id of the child process. This is created only for tracing and is
   // expected to be valid only when tracing is enabled.
   uint64 tracing_process_id_;
 
   // Skips the auto-registration of the core dumpers during Initialize().
   bool skip_core_dumpers_auto_registration_for_testing_;
 
-  // When true, the initialization phase does not start the periodic memory
-  // dumps.
-  // TODO(primiano): This should go into TraceConfig. https://goo.gl/5Hj3o0.
-  bool disable_periodic_dumps_for_testing_;
-
   DISALLOW_COPY_AND_ASSIGN(MemoryDumpManager);
 };
 
 // The delegate is supposed to be long lived (read: a Singleton) and thread
 // safe (i.e. should expect calls from any thread and handle thread hopping).
 class BASE_EXPORT MemoryDumpManagerDelegate {
  public:
   virtual void RequestGlobalMemoryDump(const MemoryDumpRequestArgs& args,
                                        const MemoryDumpCallback& callback) = 0;
 
@@ skipping 11 matching lines @@
   }
 
  private:
   DISALLOW_COPY_AND_ASSIGN(MemoryDumpManagerDelegate);
 };
 
 }  // namespace trace_event
 }  // namespace base
 
 #endif  // BASE_TRACE_EVENT_MEMORY_DUMP_MANAGER_H_