content: convert child process notifications to observer usage

content/browser/mach_broker_mac.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.
 
 #ifndef CONTENT_BROWSER_MACH_BROKER_MAC_H_
 #define CONTENT_BROWSER_MACH_BROKER_MAC_H_
 
 #include <map>
 #include <string>
 
 #include <mach/mach.h>
 
 #include "base/memory/singleton.h"
 #include "base/process.h"
 #include "base/process_util.h"
 #include "base/synchronization/lock.h"
+#include "content/public/browser/browser_child_process_observer.h"
 #include "content/public/browser/notification_observer.h"
 #include "content/public/browser/notification_registrar.h"
 
 namespace content {
 
 // On OS X, the mach_port_t of a process is required to collect metrics about
 // the process. Running |task_for_pid()| is only allowed for privileged code.
 // However, a process has port rights to all its subprocesses, so let the
 // browser's child processes send their Mach port to the browser over IPC.
 // This way, the brower can at least collect metrics of its child processes,
 // which is what it's most interested in anyway.
 //
 // Mach ports can only be sent over Mach IPC, not over the |socketpair()| that
 // the regular IPC system uses. Hence, the child processes open a Mach
 // connection shortly after launching and ipc their mach data to the browser
 // process. This data is kept in a global |MachBroker| object.
 //
 // Since this data arrives over a separate channel, it is not available
 // immediately after a child process has been started.
 class CONTENT_EXPORT MachBroker : public base::ProcessMetrics::PortProvider,
+                                  public BrowserChildProcessObserver,
                                   public NotificationObserver {
  public:
   // Returns the global MachBroker.
   static MachBroker* GetInstance();
 
   // Performs any necessary setup that cannot happen in the constructor.
   // Callers MUST acquire the lock given by GetLock() before calling this
   // method (and release the lock afterwards).
   void EnsureRunning();
 
@@ skipping 28 matching lines @@
   // and FinalizePid().
   base::Lock& GetLock();
 
   // Returns the Mach port name to use when sending or receiving messages.
   // Does the Right Thing in the browser and in child processes.
   static std::string GetMachPortName();
 
   // Implement |ProcessMetrics::PortProvider|.
   virtual mach_port_t TaskForPid(base::ProcessHandle process) const OVERRIDE;
 
+  // Implement |BrowserChildProcessObserver|.
+  virtual void BrowserChildProcessHostDisconnected(
+      const ChildProcessData& data) OVERRIDE;
+  virtual void BrowserChildProcessCrashed(
+      const ChildProcessData& data) OVERRIDE;
+
   // Implement |NotificationObserver|.
   virtual void Observe(int type,
                        const NotificationSource& source,
                        const NotificationDetails& details) OVERRIDE;
  private:
   friend class MachBrokerTest;
   friend struct DefaultSingletonTraits<MachBroker>;
 
   MachBroker();
   virtual ~MachBroker();
@@ skipping 14 matching lines @@
 
   // Mutex that guards |mach_map_|.
   mutable base::Lock lock_;
 
   DISALLOW_COPY_AND_ASSIGN(MachBroker);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_MACH_BROKER_MAC_H_