Introduce EventProcessor::OnEventProcessingStarted()

ui/views/widget/root_view_targeter.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/views/widget/root_view_targeter.h"
 
 #include "ui/views/view.h"
 #include "ui/views/view_targeter_delegate.h"
 #include "ui/views/views_switches.h"
 #include "ui/views/widget/root_view.h"
@@ skipping 15 matching lines @@
   CHECK_EQ(root, root_view_);
 
   // Return the default gesture handler if one is already set.
   if (root_view_->gesture_handler_) {
     CHECK(root_view_->gesture_handler_set_before_processing_);
     return root_view_->gesture_handler_;
   }
 
   // If no default gesture handler has already been set, do not perform any
   // targeting for a ET_GESTURE_END event.
+  // TODO(tdanderson): This check belongs in
+  //                   RootView::OnEventProcessingStarted() instead of here.
   if (gesture.type() == ui::ET_GESTURE_END)
     return NULL;
 
   // If rect-based targeting is enabled, use the gesture's bounding box to
   // determine the target. Otherwise use the center point of the gesture's
   // bounding box to determine the target.
   gfx::Rect rect(gesture.location(), gfx::Size(1, 1));
   if (views::switches::IsRectBasedTargetingEnabled() &&
       !gesture.details().bounding_box().IsEmpty()) {
     // TODO(tdanderson): Pass in the bounding box to GetEventHandlerForRect()
@@ skipping 27 matching lines @@
   // the GESTURE_END event corresponding to the removal of the last touch
   // point. In either case, no further re-targeting of |gesture| should be
   // permitted.
   if (!root_view_->gesture_handler_)
     return NULL;
 
   return previous_target->GetParentTarget();
 }
 
 }  // namespace views