WidgetDelegateView is its own contents view.

ui/views/touchui/touch_selection_controller_impl.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/views/touchui/touch_selection_controller_impl.h"
 
 #include "base/macros.h"
 #include "base/metrics/histogram_macros.h"
 #include "base/time/time.h"
 #include "ui/aura/client/cursor_client.h"
@@ skipping 219 matching lines @@
  public:
   EditingHandleView(TouchSelectionControllerImpl* controller,
                     gfx::NativeView context,
                     bool is_cursor_handle)
       : controller_(controller),
         image_(GetCenterHandleImage()),
         is_cursor_handle_(is_cursor_handle),
         draw_invisible_(false),
         weak_ptr_factory_(this) {
     widget_.reset(CreateTouchSelectionPopupWidget(context, this));
-    widget_->SetContentsView(this);
 
     aura::Window* window = widget_->GetNativeWindow();
     window->SetEventTargeter(std::unique_ptr<ui::EventTargeter>(
         new TouchHandleWindowTargeter(window, this)));
 
     // We are owned by the TouchSelectionControllerImpl.
     set_owned_by_client();
   }
 
   ~EditingHandleView() override { SetWidgetVisible(false, false); }
@@ skipping 63 matching lines @@
         CHECK(weak_ptr);
         controller_->SetDraggingHandle(nullptr);
         break;
       }
       default:
         break;
     }
   }
 
   gfx::Size GetPreferredSize() const override {
+    if (selection_bound_.type() == gfx::SelectionBound::EMPTY)

[sky, 2016/10/06 16:49:20]

It would be nice if you had a comment as to why this is here to save me the time
of verifying it's necessary.

[Evan Stade, 2016/10/06 16:51:44]

Done.

+      return gfx::Size();
     return GetSelectionWidgetBounds(selection_bound_).size();
   }
 
   bool IsWidgetVisible() const {
     return widget_->IsVisible();
   }
 
   void SetWidgetVisible(bool visible, bool quick) {
     if (widget_->IsVisible() == visible)
       return;
@@ skipping 453 matching lines @@
 
 views::WidgetDelegateView* TouchSelectionControllerImpl::GetHandle1View() {
   return selection_handle_1_.get();
 }
 
 views::WidgetDelegateView* TouchSelectionControllerImpl::GetHandle2View() {
   return selection_handle_2_.get();
 }
 
 }  // namespace views