Separate ash::test::DisplayManagerTestApi from ash

ash/test/ash_test_base.h

Index: ash/test/ash_test_base.h
diff --git a/ash/test/ash_test_base.h b/ash/test/ash_test_base.h
index c93451ee337b2493f74d4a1f37299f873fcc7df8..35300179f8c75d0b132f3bb087868ebb481ef920 100644
--- a/ash/test/ash_test_base.h
+++ b/ash/test/ash_test_base.h
@@ -114,6 +114,14 @@ class AshTestBase : public testing::Test {
   // hasn't been created yet.
   ui::test::EventGenerator& GetEventGenerator();
 
+  // Convenience method to return the DisplayManager.
+  DisplayManager* display_manager();
+
+  // Test if moving a mouse to |point_in_screen| warps it to another
+  // display.
+  bool TestIfMouseWarpsAt(ui::test::EventGenerator& event_generator,
+                          const gfx::Point& point_in_screen);
+
  protected:
   enum UserSessionBlockReason {
     FIRST_BLOCK_REASON,
@@ -168,6 +176,9 @@ class AshTestBase : public testing::Test {
 
   void DisableIME();
 
+  // Swap the primary display with the secondary.
+  void SwapPrimaryDisplay();
+
  private:
   friend class ash::AshTestImplAura;