Create DeviceMonitorWin to manage device change notifications.

This change factors out the code in HidServiceWin that manages a
MessageWindow for listening to device change notification messages. A
single window is created for all registered device interfaces and
consumers can use a simple observer interface to subscribe.

The HidService is now destroyed using AtExitManager so that the two
singletons are destroyed in the opposite of the order of their
construction.

BUG=411715

Review URL: https://codereview.chromium.org/818353002

Cr-Commit-Position: refs/heads/master@{#310046}

1 files changed, 2 insertions, 2 deletions

diff --git a/device/hid/hid_service.h b/device/hid/hid_service.h
index 6c5c5a6..8d296c0 100644
--- a/device/hid/hid_service.h
+++ b/device/hid/hid_service.h
@@ -9,6 +9,7 @@
 #include <string>
 #include <vector>
 
+#include "base/bind_helpers.h"
 #include "base/memory/ref_counted.h"
 #include "base/observer_list.h"
 #include "base/single_thread_task_runner.h"
@@ -59,6 +60,7 @@ class HidService {
                        const ConnectCallback& callback) = 0;
 
  protected:
+  friend void base::DeletePointer<HidService>(HidService* service);
   friend class HidConnectionTest;
 
   typedef std::map<HidDeviceId, HidDeviceInfo> DeviceMap;
@@ -75,8 +77,6 @@ class HidService {
   base::ThreadChecker thread_checker_;
 
  private:
-  class Destroyer;
-
   DeviceMap devices_;
   bool enumeration_ready_;
   std::vector<GetDevicesCallback> pending_enumerations_;