Reland of "[tracing] Add browser-side tests for memory dumps."

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 79 matching lines @@
   // child-process side, without having to know its own child process id.
   uint64 GetTracingProcessId() const;
 
   // Returns the name for a the allocated_objects dump. Use this to declare
   // suballocator dumps from other dump providers.
   // It should not return nullptr after the manager has been initialized.
   const char* system_allocator_pool_name() const {
     return system_allocator_pool_name_;
   };
 
+  // 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;
   FRIEND_TEST_ALL_PREFIXES(MemoryDumpManagerTest, DisableFailingDumpers);
   FRIEND_TEST_ALL_PREFIXES(MemoryDumpManagerTest,
                            UnregisterDumperFromThreadWhileDumping);
 
   // Descriptor struct used to hold information about registered MDPs. It is
@@ skipping 105 matching lines @@
   // 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_;
 
   // Name of the allocated_objects dump.
   const char* system_allocator_pool_name_;
 
   // 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 15 matching lines @@
   }
 
  private:
   DISALLOW_COPY_AND_ASSIGN(MemoryDumpManagerDelegate);
 };
 
 }  // namespace trace_event
 }  // namespace base
 
 #endif  // BASE_TRACE_EVENT_MEMORY_DUMP_MANAGER_H_