wm: Fix FD leak in watchdog when Chrome is hanging.

event_loop.h

 // Copyright (c) 2010 The Chromium OS 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 WINDOW_MANAGER_EVENT_LOOP_H_
 #define WINDOW_MANAGER_EVENT_LOOP_H_
 
 #include <map>
 #include <set>
 #include <tr1/memory>
 #include <vector>
 
 #include "base/basictypes.h"
 #include "base/scoped_ptr.h"
 #include "window_manager/callback.h"
 
 namespace window_manager {
 
 // EventLoop provides an interface for fetching X events and setting
 // timeouts.
 class EventLoop {
  public:
   EventLoop();
   ~EventLoop();
 
+  // Get the number of current-registered timeouts.  Used for testing.
+  int num_timeouts() const { return timeout_fds_.size(); }
+
   // Loop until Exit() is called, waiting for FDs to become readable or
   // timeouts to fire.
   void Run();
 
   // Exit the loop the next time we're about to wait for FDs or timeouts.
   void Exit() { exit_requested_ = true; }
 
   // Start watching a file descriptor, invoking a callback when it becomes
   // readable.  Takes ownership of 'cb', which must be a repeatable
   // (non-self-deleting) callback.
@@ skipping 104 matching lines @@
   // running B's callback afterwards.  We store the set here so that
   // RemoveFileDescriptor() can remove items from it.
   std::set<std::tr1::shared_ptr<Closure> > callbacks_to_run_;
 
   DISALLOW_COPY_AND_ASSIGN(EventLoop);
 };
 
 }  // namespace window_manager
 
 #endif  // WINDOW_MANAGER_EVENT_LOOP_H_