Avoid two targeting phases in aura client-lib and EventProcessor.

ui/events/test/test_event_processor.h

 // Copyright 2013 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 UI_EVENTS_TEST_TEST_EVENT_PROCESSOR_H_
 #define UI_EVENTS_TEST_TEST_EVENT_PROCESSOR_H_
 
 #include <memory>
 
 #include "base/macros.h"
@@ skipping 12 matching lines @@
   }
 
   int num_times_processing_finished() const {
     return num_times_processing_finished_;
   }
 
   void set_should_processing_occur(bool occur) {
     should_processing_occur_ = occur;
   }
 
+  EventTarget* GetRoot();
   void SetRoot(std::unique_ptr<EventTarget> root);
   void Reset();
 
   // EventProcessor:
   bool CanDispatchToTarget(EventTarget* target) override;
-  EventTarget* GetRootTarget() override;
+  EventTarget* GetRootForEvent(Event* event) override;
+  EventTargeter* GetDefaultEventTargeter() override;
   EventDispatchDetails OnEventFromSource(Event* event) override;
   void OnEventProcessingStarted(Event* event) override;
   void OnEventProcessingFinished(Event* event) override;
 
  private:
   std::unique_ptr<EventTarget> root_;
 
   // Used in our override of OnEventProcessingStarted(). If this value is
   // false, mark incoming events as handled.
   bool should_processing_occur_;
 
   // Counts the number of times OnEventProcessingStarted() has been called.
   int num_times_processing_started_;
 
   // Counts the number of times OnEventProcessingFinished() has been called.
   int num_times_processing_finished_;
 
   DISALLOW_COPY_AND_ASSIGN(TestEventProcessor);
 };
 
 }  // namespace test
 }  // namespace ui
 
 #endif  // UI_EVENTS_TEST_TEST_EVENT_PROCESSOR_H_