Articulate the cancel behavior in the WebTouchEvent.

ui/events/blink/blink_event_util.cc

 // 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.
 
 // MSVC++ requires this to be set before any other includes to get M_PI.
 #define _USE_MATH_DEFINES
 
 #include "ui/events/blink/blink_event_util.h"
 
 #include <stddef.h>
@@ skipping 151 matching lines @@
 blink::WebTouchEvent CreateWebTouchEventFromMotionEvent(
     const MotionEvent& event,
     bool moved_beyond_slop_region) {
   static_assert(static_cast<int>(MotionEvent::MAX_TOUCH_POINT_COUNT) ==
                     static_cast<int>(blink::WebTouchEvent::touchesLengthCap),
                 "inconsistent maximum number of active touch points");
 
   blink::WebTouchEvent result;
 
   result.type = ToWebInputEventType(event.GetAction());
-  result.cancelable = (result.type != WebInputEvent::TouchCancel);
+  result.dispatchType = result.type == WebInputEvent::TouchCancel
+                            ? WebInputEvent::EventNonBlocking
+                            : WebInputEvent::Blocking;
   result.timeStampSeconds =
       (event.GetEventTime() - base::TimeTicks()).InSecondsF();
   result.movedBeyondSlopRegion = moved_beyond_slop_region;
   result.modifiers = EventFlagsToWebEventModifiers(event.GetFlags());
   DCHECK_NE(event.GetUniqueEventId(), 0U);
   result.uniqueTouchEventId = event.GetUniqueEventId();
   result.touchesLength =
       std::min(static_cast<unsigned>(event.GetPointerCount()),
                static_cast<unsigned>(WebTouchEvent::touchesLengthCap));
   DCHECK_GT(result.touchesLength, 0U);
@@ skipping 273 matching lines @@
     case MotionEvent::TOOL_TYPE_MOUSE:
       return WebPointerProperties::PointerType::Mouse;
     case MotionEvent::TOOL_TYPE_ERASER:
       return WebPointerProperties::PointerType::Unknown;
   }
   NOTREACHED() << "Invalid MotionEvent::ToolType = " << tool_type;
   return WebPointerProperties::PointerType::Unknown;
 }
 
 }  // namespace ui