Decouple bluetooth_event_router from extension_system.

chrome/browser/extensions/api/bluetooth/bluetooth_event_router.h

Index: chrome/browser/extensions/api/bluetooth/bluetooth_event_router.h
diff --git a/chrome/browser/extensions/bluetooth_event_router.h b/chrome/browser/extensions/api/bluetooth/bluetooth_event_router.h
similarity index 83%
rename from chrome/browser/extensions/bluetooth_event_router.h
rename to chrome/browser/extensions/api/bluetooth/bluetooth_event_router.h
index 657053879190b2520ae6f936a4d4e8c665fa1105..e1935a7b2984e2736446098c72568254dfc12a18 100644
--- a/chrome/browser/extensions/bluetooth_event_router.h
+++ b/chrome/browser/extensions/api/bluetooth/bluetooth_event_router.h
@@ -2,18 +2,19 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#ifndef CHROME_BROWSER_EXTENSIONS_BLUETOOTH_EVENT_ROUTER_H_
-#define CHROME_BROWSER_EXTENSIONS_BLUETOOTH_EVENT_ROUTER_H_
+#ifndef CHROME_BROWSER_EXTENSIONS_API_BLUETOOTH_BLUETOOTH_EVENT_ROUTER_H_
+#define CHROME_BROWSER_EXTENSIONS_API_BLUETOOTH_BLUETOOTH_EVENT_ROUTER_H_
 
 #include <map>
 
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_vector.h"
-#include "chrome/browser/profiles/profile.h"
 #include "chrome/common/extensions/api/bluetooth.h"
 #include "device/bluetooth/bluetooth_adapter.h"
 #include "device/bluetooth/bluetooth_socket.h"
 
+class Profile;
+
 namespace extensions {
 
 class ExtensionBluetoothEventRouter
@@ -24,15 +25,17 @@ class ExtensionBluetoothEventRouter
 
   // adapter() will return NULL if the bluetooth adapter is not supported in the
   // current platform.
-  const device::BluetoothAdapter* adapter() const {
-    return adapter_.get();
-  }
+  scoped_refptr<const device::BluetoothAdapter> adapter();
 
   // GetMutableAdapter will return NULL if the bluetooth adapter is not
   // supported in the current platform.
-  device::BluetoothAdapter* GetMutableAdapter() {
-    return adapter_.get();
-  }
+  scoped_refptr<device::BluetoothAdapter> GetMutableAdapter();
+
+  // Called when a bluetooth event listener is added.
+  void OnListenerAdded();
+
+  // Called when a bluetooth event listener is removed.
+  void OnListenerRemoved();
 
   // Register the BluetoothSocket |socket| for use by the extensions system.
   // This class will hold onto the socket for its lifetime, or until
@@ -74,6 +77,9 @@ class ExtensionBluetoothEventRouter
     adapter_ = adapter;
   }
  private:
+  bool IsAdapterNeeded() const;
+  void InitializeAdapterIfNeeded();
+  void MaybeReleaseAdapter();
   void DispatchBooleanValueEvent(const char* event_name, bool value);
 
   bool send_discovery_events_;
@@ -82,6 +88,8 @@ class ExtensionBluetoothEventRouter
   Profile* profile_;
   scoped_refptr<device::BluetoothAdapter> adapter_;
 
+  int num_event_listeners_;
+
   // The next id to use for referring to a BluetoothSocket.  We avoid using
   // the fd of the socket because we don't want to leak that information to
   // the extension javascript.
@@ -99,4 +107,4 @@ class ExtensionBluetoothEventRouter
 
 }  // namespace extensions
 
-#endif  // CHROME_BROWSER_EXTENSIONS_BLUETOOTH_EVENT_ROUTER_H_
+#endif  // CHROME_BROWSER_EXTENSIONS_API_BLUETOOTH_BLUETOOTH_EVENT_ROUTER_H_