Adding Event.Latency.Browser.WheelUI, Passing latency_info to ProcessMouse/MouseWheelEvent functions

ui/events/event_unittest.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ui/events/event.h"
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include <memory>
@@ skipping 869 matching lines @@
     ui::PointerEvent* clone_as_ptr = clone->AsPointerEvent();
 
     EXPECT_EQ(ptr_event.type(), clone_as_ptr->type());
     EXPECT_EQ(ptr_event.pointer_id(), clone_as_ptr->pointer_id());
     EXPECT_EQ(ptr_event.pointer_details(), clone_as_ptr->pointer_details());
     EXPECT_EQ(ptr_event.location(), clone_as_ptr->location());
     EXPECT_EQ(ptr_event.root_location(), clone_as_ptr->root_location());
   }
 }
 
+TEST(EventTest, MouseEventLatencyUIComponentExists) {
+  const gfx::Point origin(0, 0);
+  MouseEvent mouseev(ET_MOUSE_PRESSED, origin, origin, EventTimeForNow(), 0, 0);
+  EXPECT_TRUE(mouseev.latency()->FindLatency(
+      ui::INPUT_EVENT_LATENCY_UI_COMPONENT, 0, nullptr));
+}
+
+TEST(EventTest, MouseWheelEventLatencyUIComponentExists) {
+  const gfx::Point origin(0, 0);
+  MouseWheelEvent mouseWheelev(gfx::Vector2d(), origin, origin,
+                               EventTimeForNow(), 0, 0);
+  EXPECT_TRUE(mouseWheelev.latency()->FindLatency(
+      ui::INPUT_EVENT_LATENCY_UI_COMPONENT, 0, nullptr));
+}
+
 TEST(EventTest, PointerEventToMouseEvent) {
   const struct {
     ui::EventType in_type;
     ui::EventType out_type;
     gfx::Point location;
     gfx::Point root_location;
     int flags;
   } kTestData[] = {
       {ui::ET_POINTER_DOWN, ui::ET_MOUSE_PRESSED, gfx::Point(10, 20),
        gfx::Point(110, 120), 0},
@@ skipping 102 matching lines @@
   memset(&native_event, 0, sizeof(XEvent));
   XButtonEvent* button_event = &(native_event.xbutton);
   button_event->type = ButtonPress;
   button_event->button = 4; // A valid wheel button number between min and max.
   MouseWheelEvent mouse_ev(&native_event);
 
   histogram_tester.ExpectTotalCount("Event.Latency.OS.MOUSE_WHEEL", 1);
 #endif
 }
 
-
 }  // namespace ui