Lazy-creates BluetoothAdapter in ExtensionBluetoothEventRouter (EBEE).

chrome/browser/extensions/bluetooth_event_router.h

Index: chrome/browser/extensions/bluetooth_event_router.h
diff --git a/chrome/browser/extensions/bluetooth_event_router.h b/chrome/browser/extensions/bluetooth_event_router.h
index 657053879190b2520ae6f936a4d4e8c665fa1105..265cd6465d7d854f8b26c2006ed43235449d3b79 100644
--- a/chrome/browser/extensions/bluetooth_event_router.h
+++ b/chrome/browser/extensions/bluetooth_event_router.h
@@ -6,6 +6,7 @@
 #define CHROME_BROWSER_EXTENSIONS_BLUETOOTH_EVENT_ROUTER_H_
 
 #include <map>
+#include <string>
 
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_vector.h"
@@ -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();
+
+  // Initializes |adapter_| when a bluetooth event listener is added.

[bryeung, 2012/11/08 19:24:02]

Please describe when this should be called, not it's effect on the internals of
the class.

[youngki, 2012/11/09 05:12:52]

Done.

+  void OnEventListenerAdded(const std::string& event_name);
+
+  // Releases |adapter_| when a bluetooth event listener is removed.

[bryeung, 2012/11/08 19:24:02]

same as above

[youngki, 2012/11/09 05:12:52]

Done.

+  void OnEventListenerRemoved(const std::string& event_name);
 
   // Register the BluetoothSocket |socket| for use by the extensions system.
   // This class will hold onto the socket for its lifetime, or until
@@ -73,7 +76,18 @@ class ExtensionBluetoothEventRouter
   void SetAdapterForTest(device::BluetoothAdapter* adapter) {
     adapter_ = adapter;
   }
+
+ protected:
+  virtual scoped_refptr<device::BluetoothAdapter> GetDefaultAdapter() const;
+
  private:
+  static bool IsBluetoothEvent(const std::string& event_name);
+
+  bool IsAdapterNeeded() const;
+
+  void InitializeAdapter();
+  void ReleaseAdapter();
+
   void DispatchBooleanValueEvent(const char* event_name, bool value);
 
   bool send_discovery_events_;
@@ -82,6 +96,8 @@ 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.