Making EventSender talk to the right WebWidget (for OOPIF support).

ui/events/blink/blink_event_util.h

 // Copyright 2015 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 UI_EVENTS_BLINK_BLINK_EVENT_UTIL_H_
 #define UI_EVENTS_BLINK_BLINK_EVENT_UTIL_H_
 
 #include <memory>
 
 #include "third_party/WebKit/public/platform/WebInputEvent.h"
 #include "ui/events/gesture_detection/motion_event.h"
 
 namespace base {
 class TimeDelta;
 }
 
 namespace blink {
 class WebGestureEvent;
 class WebInputEvent;
 class WebTouchEvent;
 }
 
 namespace gfx {
 class PointF;
+class Vector2d;
 }
 
 namespace ui {
 enum class DomCode;
 struct GestureEventData;
 struct GestureEventDetails;
 class MotionEvent;
 
 blink::WebTouchEvent CreateWebTouchEventFromMotionEvent(
     const MotionEvent& event,
     bool may_cause_scrolling);
 
 blink::WebGestureEvent CreateWebGestureEvent(const GestureEventDetails& details,
                                              base::TimeTicks timestamp,
                                              const gfx::PointF& location,
                                              const gfx::PointF& raw_location,
                                              int flags,
                                              uint32_t unique_touch_event_id);
 
 // Convenience wrapper for |CreateWebGestureEvent| using the supplied |data|.
 blink::WebGestureEvent CreateWebGestureEventFromGestureEventData(
     const GestureEventData& data);
 
 int EventFlagsToWebEventModifiers(int flags);
 
 std::unique_ptr<blink::WebInputEvent> ScaleWebInputEvent(
     const blink::WebInputEvent& event,
     float scale);
 
+// Transforms coordinates and other properties of |event|, by
+// 1) translating / shifting by |delta| and
+// 2) scaling by |scale|.
+// If |event| does not need to change, returns nullptr.
+// Otherwise, returns the transformed version of |event|.
+std::unique_ptr<blink::WebInputEvent> TranslateAndScaleWebInputEvent(
+    const blink::WebInputEvent& event,
+    const gfx::Vector2d& delta,
+    float scale);
+
 blink::WebPointerProperties::PointerType ToWebPointerType(
     MotionEvent::ToolType tool_type);
 
 int WebEventModifiersToEventFlags(int modifiers);
 
 blink::WebInputEvent::Modifiers DomCodeToWebInputEventModifiers(
     ui::DomCode code);
 
 }  // namespace ui
 
 #endif  // UI_EVENTS_BLINK_BLINK_EVENT_UTIL_H_