A mouse event created from the same native event will be marked as repeated.

ui/events/event_unittest.cc

Index: ui/events/event_unittest.cc
diff --git a/ui/events/event_unittest.cc b/ui/events/event_unittest.cc
index 523cf0883f52ec671e4d29bdfd2e1cf70d92e3bc..1297f3095b60f153b0fb08d9a5d8f01012e4c6f1 100644
--- a/ui/events/event_unittest.cc
+++ b/ui/events/event_unittest.cc
@@ -79,6 +79,15 @@ TEST(EventTest, RepeatedClick) {
   base::TimeDelta soon = start + base::TimeDelta::FromMilliseconds(1);
   base::TimeDelta later = start + base::TimeDelta::FromMilliseconds(1000);
 
+  // Same event.
+  test_ev1.set_location(gfx::Point(0, 0));
+  test_ev2.set_location(gfx::Point(1, 0));
+  test_ev1.set_time_stamp(start);
+  test_ev2.set_time_stamp(start);
+  EXPECT_FALSE(MouseEvent::IsRepeatedClickEvent(mouse_ev1, mouse_ev2));
+  MouseEvent mouse_ev3(mouse_ev1);
+  EXPECT_FALSE(MouseEvent::IsRepeatedClickEvent(mouse_ev1, mouse_ev3));
+
   // Close point.
   test_ev1.set_location(gfx::Point(0, 0));
   test_ev2.set_location(gfx::Point(1, 0));
@@ -110,6 +119,7 @@ TEST(EventTest, DoubleClickRequiresRelease) {
   const gfx::Point origin2(100, 0);
   scoped_ptr<MouseEvent> ev;
   base::TimeDelta start = base::TimeDelta::FromMilliseconds(0);
+  base::TimeDelta soon = start + base::TimeDelta::FromMilliseconds(1);
 
   ev.reset(new MouseEvent(ET_MOUSE_PRESSED, origin1, origin1, EventTimeForNow(),
                           0, 0));
@@ -130,11 +140,11 @@ TEST(EventTest, DoubleClickRequiresRelease) {
   EXPECT_EQ(1, MouseEvent::GetRepeatCount(*ev));
   ev.reset(new MouseEvent(ET_MOUSE_PRESSED, origin2, origin2, EventTimeForNow(),
                           0, 0));
-  ev->set_time_stamp(start);
+  ev->set_time_stamp(soon);
   EXPECT_EQ(2, MouseEvent::GetRepeatCount(*ev));
   ev.reset(new MouseEvent(ET_MOUSE_RELEASED, origin2, origin2,
                           EventTimeForNow(), 0, 0));
-  ev->set_time_stamp(start);
+  ev->set_time_stamp(soon);
   EXPECT_EQ(2, MouseEvent::GetRepeatCount(*ev));
   MouseEvent::ResetLastClickForTest();
 }
@@ -145,6 +155,7 @@ TEST(EventTest, SingleClickRightLeft) {
   const gfx::Point origin(0, 0);
   scoped_ptr<MouseEvent> ev;
   base::TimeDelta start = base::TimeDelta::FromMilliseconds(0);
+  base::TimeDelta soon = start + base::TimeDelta::FromMilliseconds(1);
 
   ev.reset(new MouseEvent(ET_MOUSE_PRESSED, origin, origin, EventTimeForNow(),
                           ui::EF_RIGHT_MOUSE_BUTTON,
@@ -161,7 +172,7 @@ TEST(EventTest, SingleClickRightLeft) {
   EXPECT_EQ(1, MouseEvent::GetRepeatCount(*ev));
   ev.reset(new MouseEvent(ET_MOUSE_PRESSED, origin, origin, EventTimeForNow(),
                           ui::EF_LEFT_MOUSE_BUTTON, ui::EF_LEFT_MOUSE_BUTTON));
-  ev->set_time_stamp(start);
+  ev->set_time_stamp(soon);
   EXPECT_EQ(2, MouseEvent::GetRepeatCount(*ev));
   MouseEvent::ResetLastClickForTest();
 }