touch ui: Do not hide text selection handles when screen is rotated.

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 428 matching lines @@
       selection_handle_2_(new EditingHandleView(this,
                                                 client_view->GetNativeView(),
                                                 false)),
       cursor_handle_(new EditingHandleView(this,
                                            client_view->GetNativeView(),
                                            true)),
       command_executed_(false),
       dragging_handle_(nullptr) {
   selection_start_time_ = base::TimeTicks::Now();
   aura::Window* client_window = client_view_->GetNativeView();
-  client_window->AddObserver(this);
   client_widget_ = Widget::GetTopLevelWidgetForNativeView(client_window);
   if (client_widget_)
     client_widget_->AddObserver(this);
   aura::Env::GetInstance()->AddPreTargetHandler(this);
 }
 
 TouchSelectionControllerImpl::~TouchSelectionControllerImpl() {
   UMA_HISTOGRAM_BOOLEAN("Event.TouchSelection.EndedWithAction",
                         command_executed_);
   HideQuickMenu();
   aura::Env::GetInstance()->RemovePreTargetHandler(this);
   if (client_widget_)
     client_widget_->RemoveObserver(this);
-  client_view_->GetNativeView()->RemoveObserver(this);
 }
 
 void TouchSelectionControllerImpl::SelectionChanged() {
   gfx::SelectionBound anchor, focus;
   client_view_->GetSelectionEndPoints(&anchor, &focus);
   gfx::SelectionBound screen_bound_anchor =
       ConvertToScreen(client_view_, anchor);
   gfx::SelectionBound screen_bound_focus = ConvertToScreen(client_view_, focus);
   gfx::Rect client_bounds = client_view_->GetBounds();
   if (anchor.edge_top().y() < client_bounds.y()) {
@@ skipping 162 matching lines @@
   client_view_->ExecuteCommand(command_id, event_flags);
 }
 
 void TouchSelectionControllerImpl::RunContextMenu() {
   // Context menu should appear centered on top of the selected region.
   const gfx::Rect rect = GetQuickMenuAnchorRect();
   const gfx::Point anchor(rect.CenterPoint().x(), rect.y());
   client_view_->OpenContextMenu(anchor);
 }
 
-void TouchSelectionControllerImpl::OnAncestorWindowTransformed(
-    aura::Window* window,
-    aura::Window* ancestor) {
-  client_view_->DestroyTouchSelection();
-}
-
 void TouchSelectionControllerImpl::OnWidgetClosing(Widget* widget) {
   DCHECK_EQ(client_widget_, widget);
   client_widget_->RemoveObserver(this);
   client_widget_ = nullptr;
 }
 
 void TouchSelectionControllerImpl::OnWidgetBoundsChanged(
     Widget* widget,
     const gfx::Rect& new_bounds) {
   DCHECK_EQ(client_widget_, widget);
@@ skipping 126 matching lines @@
 
 views::WidgetDelegateView* TouchSelectionControllerImpl::GetHandle1View() {
   return selection_handle_1_.get();
 }
 
 views::WidgetDelegateView* TouchSelectionControllerImpl::GetHandle2View() {
   return selection_handle_2_.get();
 }
 
 }  // namespace views