Support multiple displays in EventGenerator

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 40ae938c38607cf3f0490631efd3e47f9cce8694..8b77e0fa210728598bf613d58c283fea8784d526 100644
--- a/ash/test/ash_test_base.h
+++ b/ash/test/ash_test_base.h
@@ -18,12 +18,16 @@
 namespace aura {
 class Window;
 class WindowDelegate;
-}
+
+namespace test {
+class EventGenerator;
+}  // namespace test
+}  // namespace aura
 
 namespace ash {
 namespace internal {
 class DisplayManager;
-}  // internal
+}  // namespace internal
 
 namespace test {
 
@@ -81,6 +85,11 @@ class AshTestBase : public testing::Test {
   // Attach |window| to the current shell's root window.
   void SetDefaultParentByPrimaryRootWindow(aura::Window* window);
 
+  // Returns the EventGenerator that uses screen coordinates and works
+  // across multiple displays. It createse a new generator if it
+  // hasn't been created yet.
+  aura::test::EventGenerator& GetEventGenerator();
+
  protected:
   void RunAllPendingInMessageLoop();
 
@@ -95,6 +104,8 @@ class AshTestBase : public testing::Test {
 
   TestShellDelegate* test_shell_delegate_;
 
+  scoped_ptr<aura::test::EventGenerator> event_generator_;
+
   DISALLOW_COPY_AND_ASSIGN(AshTestBase);
 };