x11: Do not use XEvent in WebMouseEvent translation

Bug: 965991
Change-Id: I575ed42f820dfd328bcb557754441176058cab40
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1813857
Commit-Queue: Nick Yamane <nickdiego@igalia.com>
Reviewed-by: Sadrul Chowdhury <sadrul@chromium.org>
Cr-Commit-Position: refs/heads/master@{#698749}

ui/events/blink/web_input_event.cc

@@ -393,22 +393,17 @@ blink::WebMouseEvent MakeWebMouseEventFromUiEvent(const MouseEvent& event) {
       click_count = event.GetClickCount();
       break;
     case ET_MOUSE_EXITED: {
-#if defined(USE_X11)
-      // NotifyVirtual events are created for intermediate windows that the
-      // pointer crosses through. These occur when middle clicking.
-      // Change these into mouse move events.
-      const PlatformEvent& native_event = event.native_event();
-
-      if (native_event && native_event->type == LeaveNotify &&
-          native_event->xcrossing.detail == NotifyVirtual) {
+      // When MOUSE_EXITED is created for intermediate windows that the
+      // pointer crosses through, change these into mouse move events.
+      const Event::Properties* props = event.properties();
+      if (props && props->contains(kPropertyMouseCrossedIntermediateWindow)) {
         type = blink::WebInputEvent::kMouseMove;
-        break;
-      }
-#endif
+      } else {
         static bool s_send_leave =
             base::FeatureList::IsEnabled(features::kSendMouseLeaveEvents);
         type = s_send_leave ? blink::WebInputEvent::kMouseLeave
                             : blink::WebInputEvent::kMouseMove;
+      }
       break;
     }
     case ET_MOUSE_ENTERED:

ui/events/event.cc

@@ -52,19 +52,28 @@ bool X11EventHasNonStandardState(const PlatformEvent& event) {
   return event && (event->xkey.state & ~kAllStateMask) != 0;
 }
 
-Event::Properties GetKeyEventPropertiesFromXKeyEvent(const XKeyEvent& xev) {
+Event::Properties GetEventPropertiesFromXEvent(EventType type,
+                                               const XEvent& xev) {
   using Values = std::vector<uint8_t>;
   Event::Properties properties;
-
+  if (type == ET_KEY_PRESSED || type == ET_KEY_RELEASED) {
     // Keyboard group
-  uint8_t group = XkbGroupForCoreState(xev.state);
+    uint8_t group = XkbGroupForCoreState(xev.xkey.state);
     properties.emplace(kPropertyKeyboardGroup, Values{group});
 
     // IBus-gtk specific flags
-  uint8_t ibus_flags = (xev.state >> kPropertyKeyboardIBusFlagOffset) &
+    uint8_t ibus_flags = (xev.xkey.state >> kPropertyKeyboardIBusFlagOffset) &
                          kPropertyKeyboardIBusFlagMask;
     properties.emplace(kPropertyKeyboardIBusFlag, Values{ibus_flags});
 
+  } else if (type == ET_MOUSE_EXITED) {
+    // NotifyVirtual events are created for intermediate windows that the
+    // pointer crosses through. These occur when middle clicking.
+    // Change these into mouse move events.
+    bool crossing_intermediate_window = xev.xcrossing.detail == NotifyVirtual;
+    properties.emplace(kPropertyMouseCrossedIntermediateWindow,
+                       crossing_intermediate_window);
+  }
   return properties;
 }
 #endif
@@ -494,6 +503,9 @@ MouseEvent::MouseEvent(const PlatformEvent& native_event)
   latency()->AddLatencyNumber(INPUT_EVENT_LATENCY_UI_COMPONENT);
   if (type() == ET_MOUSE_PRESSED || type() == ET_MOUSE_RELEASED)
     SetClickCount(GetRepeatCount(*this));
+#if defined(USE_X11)
+  SetProperties(GetEventPropertiesFromXEvent(type(), *native_event));
+#endif
 }
 
 MouseEvent::MouseEvent(EventType type,
@@ -909,7 +921,7 @@ KeyEvent::KeyEvent(const PlatformEvent& native_event, int event_flags)
 #if defined(USE_X11)
   NormalizeFlags();
   key_ = GetDomKeyFromXEvent(native_event);
-  SetProperties(GetKeyEventPropertiesFromXKeyEvent(native_event->xkey));
+  SetProperties(GetEventPropertiesFromXEvent(type(), *native_event));
 #elif defined(OS_WIN)
   // Only Windows has native character events.
   if (is_char_) {

ui/events/event_utils.h

@@ -50,6 +50,11 @@ constexpr char kPropertyKeyboardIBusFlag[] = "_keyevent_kbd_ibus_ime_flags_";
 constexpr unsigned int kPropertyKeyboardIBusFlagOffset = 24;
 constexpr unsigned int kPropertyKeyboardIBusFlagMask = 0x03;
 
+// Key used to store mouse event flag telling ET_MOUSE_EXITED must actually be
+// interpreted as "crossing intermediate window" in blink context.
+constexpr char kPropertyMouseCrossedIntermediateWindow[] =
+    "_mouseevent_cros_window_";
+
 // Returns a ui::Event wrapping a native event. Ownership of the returned value
 // is transferred to the caller.
 EVENTS_EXPORT std::unique_ptr<Event> EventFromNative(