MacViews: Fix some TableView tests, add ui::EventGenerator::set_assume_window_at_origin(bool)

ui/events/test/event_generator.h

Index: ui/events/test/event_generator.h
diff --git a/ui/events/test/event_generator.h b/ui/events/test/event_generator.h
index 51268390a42ba1637d3bae85982daa1b656e0e9e..435f72afcc4d03213d5dbccfa001ad5d86d9c6c7 100644
--- a/ui/events/test/event_generator.h
+++ b/ui/events/test/event_generator.h
@@ -159,6 +159,20 @@ class EventGenerator {
   void set_flags(int flags) { flags_ = flags; }
   int flags() const { return flags_; }
 
+  // Many tests assume a window created at (0,0) will remain there when shown.
+  // However, an operating system's window manager may reposition the window
+  // into the work area. This can disrupt the coordinates used on test events,
+  // so an EventGeneratorDelegate may skip the step that remaps coordinates in
+  // the root window to window coordinates when dispatching events.
+  // Setting this to false skips that step, in which case the test must ensure
+  // it correctly maps coordinates in window coordinates to root window (screen)
+  // coordinates when calling, e.g., set_current_location().
+  // Default is true.
+  void set_assume_window_at_origin(bool assume_window_at_origin) {
+    assume_window_at_origin_ = assume_window_at_origin;
+  }
+  bool assume_window_at_origin() { return assume_window_at_origin_; }
+
   // Generates a left button press event.
   void PressLeftButton();
 
@@ -446,15 +460,23 @@ class EventGenerator {
 
   std::unique_ptr<EventGeneratorDelegate> delegate_;
   gfx::Point current_location_;
-  EventTarget* current_target_;
-  int flags_;
-  bool grab_;
+  EventTarget* current_target_ = nullptr;
+  int flags_ = 0;
+  bool grab_ = false;
+
   ui::PointerDetails touch_pointer_details_;
 
   std::list<std::unique_ptr<Event>> pending_events_;
+
   // Set to true to cause events to be posted asynchronously.
-  bool async_;
-  Target target_;
+  bool async_ = false;
+
+  // Whether to skip mapping of coordinates from the root window to a hit window
+  // when dispatching events.
+  bool assume_window_at_origin_ = true;
+
+  Target target_ = Target::WIDGET;
+
   std::unique_ptr<base::TickClock> tick_clock_;
 
   DISALLOW_COPY_AND_ASSIGN(EventGenerator);