Add pointer id to the WebMouseEvent's constructors

third_party/WebKit/public/platform/WebMouseEvent.h

 // Copyright 2016 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.
 
 #ifndef WebMouseEvent_h
 #define WebMouseEvent_h
 
 #include "WebInputEvent.h"
 
 namespace blink {
 
 class WebGestureEvent;
 
 // See WebInputEvent.h for details why this pack is here.
 #pragma pack(push, 4)
 
 // WebMouseEvent --------------------------------------------------------------
 
 // TODO(mustaq): We are truncating |float|s to integers whenever setting
 //   coordinate values, to avoid regressions for now. Will be fixed later
 //   on. crbug.com/456625
 class WebMouseEvent : public WebInputEvent, public WebPointerProperties {
  public:
+  static constexpr int kMousePointerId = std::numeric_limits<int>::max();

[haraken, 2017/05/02 00:27:23]

kMousePointerId => kUndefinedMousePointerID or something?

+
   int click_count;
 
   WebMouseEvent(Type type_param,
                 int x_param,
                 int y_param,
                 int global_x_param,
                 int global_y_param,
                 int modifiers_param,
-                double time_stamp_seconds_param)
+                double time_stamp_seconds_param,
+                int id_param = kMousePointerId)
       : WebInputEvent(sizeof(WebMouseEvent),
                       type_param,
                       modifiers_param,
                       time_stamp_seconds_param),
-        WebPointerProperties(),
+        WebPointerProperties(id_param),
         position_in_widget_(x_param, y_param),
         position_in_screen_(global_x_param, global_y_param) {}
 
   WebMouseEvent(Type type_param,
                 WebFloatPoint position,
                 WebFloatPoint global_position,
                 Button button_param,
                 int click_count_param,
                 int modifiers_param,
-                double time_stamp_seconds_param)
+                double time_stamp_seconds_param,
+                int id_param = kMousePointerId)
       : WebInputEvent(sizeof(WebMouseEvent),
                       type_param,
                       modifiers_param,
                       time_stamp_seconds_param),
-        WebPointerProperties(button_param, PointerType::kMouse),
+        WebPointerProperties(id_param, button_param, PointerType::kMouse),
         click_count(click_count_param),
         position_in_widget_(floor(position.x), floor(position.y)),
         position_in_screen_(floor(global_position.x),
                             floor(global_position.y)) {}
 
   WebMouseEvent(Type type_param,
                 int modifiers_param,
-                double time_stamp_seconds_param)
+                double time_stamp_seconds_param,
+                int id_param = kMousePointerId)
       : WebMouseEvent(sizeof(WebMouseEvent),
                       type_param,
                       modifiers_param,
-                      time_stamp_seconds_param) {}
+                      time_stamp_seconds_param,
+                      id_param) {}
 
-  WebMouseEvent() : WebMouseEvent(sizeof(WebMouseEvent)) {}
+  WebMouseEvent() : WebMouseEvent(sizeof(WebMouseEvent), kMousePointerId) {}
 
   bool FromTouch() const {
     return (GetModifiers() & kIsCompatibilityEventForTouch) != 0;
   }
 
 #if INSIDE_BLINK
   BLINK_PLATFORM_EXPORT WebMouseEvent(Type type_param,
                                       const WebGestureEvent&,
                                       Button button_param,
                                       int click_count_param,
                                       int modifiers_param,
-                                      double time_stamp_seconds_param);
+                                      double time_stamp_seconds_param,
+                                      int id_param = kMousePointerId);
 
   BLINK_PLATFORM_EXPORT WebFloatPoint MovementInRootFrame() const;
   BLINK_PLATFORM_EXPORT WebFloatPoint PositionInRootFrame() const;
 
   // Sets any scaled values to be their computed values and sets |frameScale|
   // back to 1 and |translateX|, |translateY| back to 0.
   BLINK_PLATFORM_EXPORT WebMouseEvent FlattenTransform() const;
 #endif
 
   WebFloatPoint PositionInWidget() const { return position_in_widget_; }
   void SetPositionInWidget(float x, float y) {
     position_in_widget_ = WebFloatPoint(floor(x), floor(y));
   }
 
   WebFloatPoint PositionInScreen() const { return position_in_screen_; }
   void SetPositionInScreen(float x, float y) {
     position_in_screen_ = WebFloatPoint(floor(x), floor(y));
   }
 
  protected:
-  explicit WebMouseEvent(unsigned size_param)
-      : WebInputEvent(size_param), WebPointerProperties() {}
+  WebMouseEvent(unsigned size_param, int id)
+      : WebInputEvent(size_param), WebPointerProperties(id) {}
 
   WebMouseEvent(unsigned size_param,
                 Type type,
                 int modifiers,
-                double time_stamp_seconds)
+                double time_stamp_seconds,
+                int id)
       : WebInputEvent(size_param, type, modifiers, time_stamp_seconds),
-        WebPointerProperties() {}
+        WebPointerProperties(id) {}
 
   void FlattenTransformSelf();
 
  private:
   // Widget coordinate, which is relative to the bound of current RenderWidget
   // (e.g. a plugin or OOPIF inside a RenderView). Similar to viewport
   // coordinates but without DevTools emulation transform or overscroll applied.
   WebFloatPoint position_in_widget_;
 
   // Screen coordinate
   WebFloatPoint position_in_screen_;
 };
 
 #pragma pack(pop)
 
 }  // namespace blink
 
 #endif  // WebMouseEvent_h