NOCOMMIT: Rebased https://codereview.chromium.org/2696503004 on service rename

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 61d1dd085da9c0d027516a5f68b63b4269bf5df4..baf294ed75d80a3ead6ed5675d23df89648939d2 100644
--- a/base/trace_event/memory_dump_manager.h
+++ b/base/trace_event/memory_dump_manager.h
@@ -54,13 +54,10 @@ class BASE_EXPORT MemoryDumpManager : public TraceLog::EnabledStateObserver {
   // On the other side, the MemoryDumpManager will not be fully operational
   // (i.e. will NACK any RequestGlobalMemoryDump()) until initialized.
   // Arguments:
-  //  is_coordinator: if true this MemoryDumpManager instance will act as a
-  //      coordinator and schedule periodic dumps (if enabled via TraceConfig);
-  //      false when the MemoryDumpManager is initialized in a slave process.
   //  delegate: inversion-of-control interface for embedder-specific behaviors
   //      (multiprocess handshaking). See the lifetime and thread-safety
   //      requirements in the |MemoryDumpManagerDelegate| docstring.
-  void Initialize(MemoryDumpManagerDelegate* delegate, bool is_coordinator);
+  void Initialize(std::unique_ptr<MemoryDumpManagerDelegate> delegate);
 
   // (Un)Registers a MemoryDumpProvider instance.
   // Args:
@@ -371,10 +368,7 @@ class BASE_EXPORT MemoryDumpManager : public TraceLog::EnabledStateObserver {
   std::unordered_set<StringPiece, StringPieceHash>
       strict_thread_check_blacklist_;
 
-  MemoryDumpManagerDelegate* delegate_;  // Not owned.
-
-  // When true, this instance is in charge of coordinating periodic dumps.
-  bool is_coordinator_;
+  std::unique_ptr<MemoryDumpManagerDelegate> delegate_;
 
   // Protects from concurrent accesses to the |dump_providers_*| and |delegate_|
   // to guard against disabling logging while dumping on another thread.
@@ -411,11 +405,15 @@ class BASE_EXPORT MemoryDumpManagerDelegate {
   virtual void RequestGlobalMemoryDump(const MemoryDumpRequestArgs& args,
                                        const MemoryDumpCallback& callback) = 0;
 
+  virtual bool IsCoordinator() const = 0;
+
   // Returns tracing process id of the current process. This is used by
   // MemoryDumpManager::GetTracingProcessId.
   virtual uint64_t GetTracingProcessId() const = 0;
 
  protected:
+  friend std::default_delete<MemoryDumpManagerDelegate>;
+
   MemoryDumpManagerDelegate() {}
   virtual ~MemoryDumpManagerDelegate() {}