Send resize event when the screen info changes.

ui/aura/test/test_screen.cc

 // Copyright (c) 2012 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/test/test_screen.h"
 
 #include "base/logging.h"
 #include "ui/aura/env.h"
 #include "ui/aura/window.h"
 #include "ui/aura/window_event_dispatcher.h"
@@ skipping 46 matching lines @@
 
 void TestScreen::SetDisplayRotation(gfx::Display::Rotation rotation) {
   gfx::Rect bounds_in_pixel(display_.GetSizeInPixel());
   gfx::Rect new_bounds(bounds_in_pixel);
   if (IsRotationPortrait(rotation) != IsRotationPortrait(display_.rotation())) {
     new_bounds.set_width(bounds_in_pixel.height());
     new_bounds.set_height(bounds_in_pixel.width());
   }
   display_.set_rotation(rotation);
   display_.SetScaleAndBounds(display_.device_scale_factor(), new_bounds);
-  host_->SetRootTransform(GetRotationTransform() * GetUIScaleTransform());
+  if (host_)
+    host_->SetRootTransform(GetRotationTransform() * GetUIScaleTransform());

[sadrul, 2015/04/10 22:58:30]

We don't do null checks elsewhere in this file. Is some test missing a call to
CreateHostForPrimaryDisplay()?

 }
 
 void TestScreen::SetUIScale(float ui_scale) {
   ui_scale_ = ui_scale;
   gfx::Rect bounds_in_pixel(display_.GetSizeInPixel());
   gfx::Rect new_bounds = gfx::ToNearestRect(
       gfx::ScaleRect(bounds_in_pixel, 1.0f / ui_scale));
   display_.SetScaleAndBounds(display_.device_scale_factor(), new_bounds);
   host_->SetRootTransform(GetRotationTransform() * GetUIScaleTransform());
 }
@@ skipping 88 matching lines @@
 
 TestScreen::TestScreen(const gfx::Rect& screen_bounds)
     : host_(NULL),
       ui_scale_(1.0f) {
   static int64 synthesized_display_id = 2000;
   display_.set_id(synthesized_display_id++);
   display_.SetScaleAndBounds(1.0f, screen_bounds);
 }
 
 }  // namespace aura