Ensure that we don't report huge mouse movement deltas for mouse enter and leave events.

content/browser/renderer_host/render_widget_host_view_aura.h

 // 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.
 
 #ifndef CONTENT_BROWSER_RENDERER_HOST_RENDER_WIDGET_HOST_VIEW_AURA_H_
 #define CONTENT_BROWSER_RENDERER_HOST_RENDER_WIDGET_HOST_VIEW_AURA_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 406 matching lines @@
 
   // Returns whether the widget needs to grab mouse capture to work properly.
   bool NeedsMouseCapture();
 
   // Confirm existing composition text in the webpage and ask the input method
   // to cancel its ongoing composition session.
   void FinishImeCompositionSession();
 
   // This method computes movementX/Y and keeps track of mouse location for
   // mouse lock on all mouse move events.
-  void ModifyEventMovementAndCoords(blink::WebMouseEvent* event);
+  // |event| contains the WebMouseEvent being modified.
+  // |ui_mouse_event| contains the mouse event received.
+  void ModifyEventMovementAndCoords(blink::WebMouseEvent* event,
+                                    ui::MouseEvent* ui_mouse_event);
 
   // Sends an IPC to the renderer process to communicate whether or not
   // the mouse cursor is visible anywhere on the screen.
   void NotifyRendererOfCursorVisibilityState(bool is_visible);
 
   // If |clip| is non-empty and and doesn't contain |rect| or |clip| is empty
   // SchedulePaint() is invoked for |rect|.
   void SchedulePaintIfNotInClip(const gfx::Rect& rect, const gfx::Rect& clip);
 
   // Helper method to determine if, in mouse locked mode, the cursor should be
@@ skipping 241 matching lines @@
   // Allows tests to send gesture events for testing without first sending a
   // corresponding touch sequence, as would be required by
   // RenderWidgetHostInputEventRouter.
   bool disable_input_event_router_for_testing_;
 
   // The routing and process IDs for the last RenderWidgetHost which had a
   // TextInputState of non-NONE.
   int32_t last_active_widget_process_id_;
   int32_t last_active_widget_routing_id_;
 
+  // The last mouse move position. It is used as the location of subsequent
+  // mouse enter and leave events.
+  gfx::Point last_mouse_position_;
+
   base::WeakPtrFactory<RenderWidgetHostViewAura> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(RenderWidgetHostViewAura);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_RENDERER_HOST_RENDER_WIDGET_HOST_VIEW_AURA_H_