Don't drop the floating point part of events when converting types.

ui/aura/window_targeter.cc

 // Copyright (c) 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.
 
 #include "ui/aura/window_targeter.h"
 
 #include "ui/aura/client/capture_client.h"
 #include "ui/aura/client/event_client.h"
 #include "ui/aura/client/focus_client.h"
 #include "ui/aura/window.h"
@@ skipping 134 matching lines @@
   if (capture_window)
     return capture_window;
 
   if (event.IsTouchEvent()) {
     // Query the gesture-recognizer to find targets for touch events.
     const ui::TouchEvent& touch = static_cast<const ui::TouchEvent&>(event);
     ui::GestureConsumer* consumer =
         ui::GestureRecognizer::Get()->GetTouchLockedTarget(touch);
     if (consumer)
       return static_cast<Window*>(consumer);
-    consumer =
-        ui::GestureRecognizer::Get()->GetTargetForLocation(
-            event.location(), touch.source_device_id());
+    consumer = ui::GestureRecognizer::Get()->GetTargetForLocation(
+        event.location_f(), touch.source_device_id());
     if (consumer)
       return static_cast<Window*>(consumer);
 
     // If the initial touch is outside the root window, target the root.
     if (!root_window->bounds().Contains(event.location()))
       return root_window;
   }
 
   return nullptr;
 }
@@ skipping 20 matching lines @@
           static_cast<Window*>(targeter->FindTargetForEvent(child, event));
       if (child_target_window)
         return child_target_window;
     }
     target->ConvertEventToTarget(root_window, event);
   }
   return root_window->CanAcceptEvent(*event) ? root_window : nullptr;
 }
 
 }  // namespace aura