[DevTools] Consolidate overlay-related functionality in Overlay domain

third_party/WebKit/Source/core/inspector/InspectorOverlayHost.cpp

 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
  * 2.  Redistributions in binary form must reproduce the above copyright
@@ skipping 12 matching lines @@
  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
  * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #include "core/inspector/InspectorOverlayHost.h"
 
 namespace blink {
 
-InspectorOverlayHost::InspectorOverlayHost() : listener_(nullptr) {}
+InspectorOverlayHost::InspectorOverlayHost(Listener* listener)
+    : listener_(listener) {}
 
 void InspectorOverlayHost::resume() {
   if (listener_)
     listener_->OverlayResumed();
 }
 
 void InspectorOverlayHost::stepOver() {
   if (listener_)
     listener_->OverlaySteppedOver();
 }
 
 DEFINE_TRACE(InspectorOverlayHost) {
   visitor->Trace(listener_);
 }
 
 }  // namespace blink