Move DisplayList to display; add ScreenBase.

ui/display/display_list_unittest.cc

 // Copyright 2016 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/mus/display_list.h"
+#include "ui/display/display_list.h"
 
 #include <string>
 #include <vector>
 
 #include "base/strings/string_number_conversions.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "ui/display/display.h"
 #include "ui/display/display_observer.h"
 
 using display::Display;
 
-namespace views {
+namespace display {
 namespace {
 
 class DisplayObserverImpl : public display::DisplayObserver {
  public:
   DisplayObserverImpl() {}
   ~DisplayObserverImpl() override {}
 
   std::string GetAndClearChanges() {
     std::string changes;
     std::swap(changes, changes_);
@@ skipping 75 matching lines @@
   EXPECT_EQ(3, display_list.GetPrimaryDisplayIterator()->id());
 
   // Delete the first.
   display_list.RemoveDisplay(2);
   ASSERT_EQ(1u, display_list.displays().size());
   EXPECT_EQ("Removed id=2", observer.GetAndClearChanges());
   EXPECT_EQ(3, display_list.GetPrimaryDisplayIterator()->id());
 }
 
 }  // namespace
-}  // namespace views
+}  // namespace display