First crack at implementing the touch explaration mode.

ui/aura/window_event_dispatcher.cc

 // Copyright 2014 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.
 
 #include "ui/aura/window_event_dispatcher.h"
 
 #include "base/bind.h"
 #include "base/debug/trace_event.h"
 #include "base/logging.h"
 #include "base/message_loop/message_loop.h"
@@ skipping 144 matching lines @@
                        ui::EF_NONE);
   DispatchDetails details =
       DispatchMouseEnterOrExit(event, ui::ET_MOUSE_EXITED);
   if (details.dispatcher_destroyed)
     return;
 }
 
 void WindowEventDispatcher::ProcessedTouchEvent(ui::TouchEvent* event,
                                                 Window* window,
                                                 ui::EventResult result) {
+  LOG(ERROR) << "WED::ProcessedTouchEvent, type=" << event->type();
   scoped_ptr<ui::GestureRecognizer::Gestures> gestures;
   gestures.reset(ui::GestureRecognizer::Get()->
       ProcessTouchEventForGesture(*event, result, window));
   DispatchDetails details = ProcessGestures(gestures.get());
   if (details.dispatcher_destroyed)
     return;
 }
 
 void WindowEventDispatcher::HoldPointerMoves() {
   if (!move_hold_count_)
@@ skipping 685 matching lines @@
       break;
 
     default:
       NOTREACHED();
       break;
   }
   PreDispatchLocatedEvent(target, event);
 }
 
 }  // namespace aura