MacViews: Add WidgetEventGenerator to abstract platform-specific event generation for tests.

ui/events/cocoa/events_mac_unittest.mm

Index: ui/events/cocoa/events_mac_unittest.mm
diff --git a/ui/events/cocoa/events_mac_unittest.mm b/ui/events/cocoa/events_mac_unittest.mm
index adaafea1df397d907ebca93c1d1007d0afbebbfe..71b5b763ab4d3d97d3a95de68d57bf5659ef1417 100644
--- a/ui/events/cocoa/events_mac_unittest.mm
+++ b/ui/events/cocoa/events_mac_unittest.mm
@@ -288,4 +288,14 @@ TEST_F(EventsMacTest, NativeTitlebarEventLocation) {
             ui::EventLocationFromNative(event));
 }
 
+// Tests mouse movement events.
+TEST_F(EventsMacTest, MoveEvents) {
+  gfx::Point location(5, 10);
+
+  NSEvent* event = TestMouseEvent(NSMouseMoved, location, 0);
+  EXPECT_EQ(ui::ET_MOUSE_MOVED, ui::EventTypeFromNative(event));
+  EXPECT_EQ(ui::EF_NONE, ui::EventFlagsFromNative(event));
+  EXPECT_EQ(location, ui::EventLocationFromNative(event));
+}
+
 }  // namespace ui