Add pointer id to the WebMouseEvent's constructors

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 838 matching lines @@
     EXPECT_TRUE(pointer_event.IsPointerEvent());
   }
 }
 
 TEST(EventTest, PointerEventId) {
   {
     ui::MouseEvent mouse_event(ui::ET_MOUSE_PRESSED, gfx::Point(0, 0),
                                gfx::Point(0, 0), base::TimeTicks(), 0, 0);
     ui::PointerEvent pointer_event(mouse_event);
     EXPECT_EQ(pointer_event.pointer_details().id,
-              ui::MouseEvent::kMousePointerId);
+              ui::MouseEvent::kDefaultMousePointerId);
   }
 
   for (int touch_id = 0; touch_id < 8; touch_id++) {
     ui::TouchEvent touch_event(
         ui::ET_TOUCH_PRESSED, gfx::Point(0, 0), base::TimeTicks(),
         PointerDetails(ui::EventPointerType::POINTER_TYPE_TOUCH, touch_id));
     ui::PointerEvent pointer_event(touch_event);
     EXPECT_EQ(pointer_event.pointer_details().id, touch_id);
   }
 }
@@ skipping 222 matching lines @@
   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