Indicate whether a touch event will cause scrolling

content/browser/renderer_host/input/web_input_event_util.cc

 // Copyright 2013 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 "content/browser/renderer_host/input/web_input_event_util.h"
 
 #include <cmath>
@@ skipping 237 matching lines @@
     base::strlcpy(event->keyIdentifier, id, sizeof(event->keyIdentifier) - 1);
   } else {
     base::snprintf(event->keyIdentifier,
                    sizeof(event->keyIdentifier),
                    "U+%04X",
                    base::ToUpperASCII(static_cast<int>(windows_key_code)));
   }
 }
 
 blink::WebTouchEvent CreateWebTouchEventFromMotionEvent(
-    const ui::MotionEvent& event) {
+    const ui::MotionEvent& event,
+    bool causes_scrolling) {
   COMPILE_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;
 
   WebTouchEventTraits::ResetType(
       ToWebInputEventType(event.GetAction()),
       (event.GetEventTime() - base::TimeTicks()).InSecondsF(),
       &result);
+  result.causesScrollingIfUncanceled = causes_scrolling;
 
   result.modifiers = EventFlagsToWebEventModifiers(event.GetFlags());
   result.touchesLength =
       std::min(event.GetPointerCount(),
                static_cast<size_t>(WebTouchEvent::touchesLengthCap));
   DCHECK_GT(result.touchesLength, 0U);
 
   for (size_t i = 0; i < result.touchesLength; ++i)
     result.touches[i] = CreateWebTouchPoint(event, i);
 
@@ skipping 150 matching lines @@
     flags |= ui::EF_CAPS_LOCK_DOWN;
   if (modifiers & blink::WebInputEvent::IsAutoRepeat)
     flags |= ui::EF_IS_REPEAT;
   if (modifiers & blink::WebInputEvent::IsKeyPad)
     flags |= ui::EF_NUMPAD_KEY;
 
   return flags;
 }
 
 }  // namespace content