Fix jittering cursor in screen magnifier mode

ash/magnifier/magnification_controller_unittest.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 "ash/magnifier/magnification_controller.h"
 
 #include "ash/accessibility_types.h"
 #include "ash/shell.h"
 #include "ash/test/ash_test_base.h"
 #include "base/strings/stringprintf.h"
@@ skipping 682 matching lines @@
 
   UpdateDisplay("500x500");
   EXPECT_EQ("0,0 500x500", screen->GetPrimaryDisplay().bounds().ToString());
   EXPECT_EQ(2.0f, GetMagnificationController()->GetScale());
 
   GetMagnificationController()->SetEnabled(false);
   EXPECT_EQ("0,0 500x500", screen->GetPrimaryDisplay().bounds().ToString());
   EXPECT_EQ(1.0f, GetMagnificationController()->GetScale());
 }
 
+// Make sure that mouse can move across display in magnified mode.
+TEST_F(MagnificationControllerTest, MoveMouseToSecondDisplay) {
+  UpdateDisplay("0+0-500x500, 500+0-500x500");
+  EXPECT_EQ(2ul, display::Screen::GetScreen()->GetAllDisplays().size());
+
+  aura::Window::Windows root_windows = Shell::GetAllRootWindows();
+
+  GetEventGenerator().MoveMouseTo(gfx::Point(250, 250));
+  EXPECT_TRUE(root_windows[1]->layer()->transform().IsIdentity());
+  EXPECT_TRUE(root_windows[0]->layer()->transform().IsIdentity());
+
+  GetMagnificationController()->SetEnabled(true);
+  EXPECT_FALSE(root_windows[0]->layer()->transform().IsIdentity());
+  EXPECT_TRUE(root_windows[1]->layer()->transform().IsIdentity());
+
+  GetEventGenerator().MoveMouseTo(gfx::Point(750, 250));
+  EXPECT_FALSE(root_windows[1]->layer()->transform().IsIdentity());
+  EXPECT_TRUE(root_windows[0]->layer()->transform().IsIdentity());
+
+  GetMagnificationController()->SetEnabled(false);
+  EXPECT_TRUE(root_windows[1]->layer()->transform().IsIdentity());
+  EXPECT_TRUE(root_windows[0]->layer()->transform().IsIdentity());
+}
+
 }  // namespace ash