chrome.bluetooth API improvements.

chrome/browser/extensions/api/bluetooth/bluetooth_extension_function.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 CHROME_BROWSER_EXTENSIONS_API_BLUETOOTH_BLUETOOTH_EXTENSION_FUNCTION_H_
 #define CHROME_BROWSER_EXTENSIONS_API_BLUETOOTH_BLUETOOTH_EXTENSION_FUNCTION_H_
 
 #include "base/memory/ref_counted.h"
 #include "base/memory/weak_ptr.h"
 #include "extensions/browser/extension_function.h"
 
 namespace device {
 
 class BluetoothAdapter;
 
 }  // namespace device
 
 namespace extensions {
-
 namespace api {
 
 // Base class for bluetooth extension functions. This class initializes
-// bluetooth adapter and calls DoWork() implemented by individual bluetooth
-// extension functions.
+// bluetooth adapter and calls (on the UI thread) DoWork() implemented by
+// individual bluetooth extension functions.
 class BluetoothExtensionFunction : public UIThreadExtensionFunction {
  public:
   BluetoothExtensionFunction();
 
  protected:
   virtual ~BluetoothExtensionFunction();
 
   // ExtensionFunction:
   virtual bool RunImpl() OVERRIDE;
 
  private:
   void RunOnAdapterReady(scoped_refptr<device::BluetoothAdapter> adapter);
 
   // Implemented by individual bluetooth extension functions, called
-  // automatically once |adapter| has been initialized.
+  // automatically on the UI thread once |adapter| has been initialized.
   virtual bool DoWork(scoped_refptr<device::BluetoothAdapter> adapter) = 0;
 
   DISALLOW_COPY_AND_ASSIGN(BluetoothExtensionFunction);
 };
 
 }  // namespace api
-
 }  // namespace extensions
 
 #endif  // CHROME_BROWSER_EXTENSIONS_API_BLUETOOTH_BLUETOOTH_EXTENSION_FUNCTION_H_