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

base/trace_event/memory_dump_manager.h

Index: base/trace_event/memory_dump_manager.h
diff --git a/base/trace_event/memory_dump_manager.h b/base/trace_event/memory_dump_manager.h
index fc32270600a2aa626862961e80dcc9d2a63a79a1..dfaf3a1fc9e0e16a226a5f833c50d648e4629fde 100644
--- a/base/trace_event/memory_dump_manager.h
+++ b/base/trace_event/memory_dump_manager.h
@@ -97,6 +97,11 @@ class BASE_EXPORT MemoryDumpManager : public TraceLog::EnabledStateObserver {
     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>;
@@ -222,6 +227,11 @@ class BASE_EXPORT MemoryDumpManager : public TraceLog::EnabledStateObserver {
   // 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);
 };