Experimental fix for scroll animation update bug. [DO NOT COMMIT THIS CHANGE]

content/browser/site_per_process_browsertest.cc

 // 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.
 
 #include "content/browser/site_per_process_browsertest.h"
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include <algorithm>
@@ skipping 1186 matching lines @@
   // Scroll the parent frame downward.
   blink::WebMouseWheelEvent scroll_event(
       blink::WebInputEvent::kMouseWheel, blink::WebInputEvent::kNoModifiers,
       blink::WebInputEvent::kTimeStampForTesting);
   scroll_event.SetPositionInWidget(1, 1);
   scroll_event.delta_x = 0.0f;
   scroll_event.delta_y = -5.0f;
   // Set has_precise_scroll_deltas to keep these events off the animated scroll
   // pathways, which currently break this test.
   // https://bugs.chromium.org/p/chromium/issues/detail?id=710513
-  scroll_event.has_precise_scrolling_deltas = true;
   rwhv_parent->ProcessMouseWheelEvent(scroll_event, ui::LatencyInfo());
 
   // Ensure that the view position is propagated to the child properly.
   filter->Wait();
   update_rect = filter->last_rect();
   EXPECT_LT(update_rect.y(), initial_y);
   filter->Reset();
   ack_observer->Reset();
 
   // Now scroll the nested frame upward, which should bubble to the parent.
@@ skipping 8775 matching lines @@
     names.insert(root->children[0]->frame_entry->frame_unique_name());
   }
 
   // More than one entry in the set means that the subframe frame navigation
   // entries didn't have a consistent unique name. This will break history
   // navigations =(
   EXPECT_THAT(names, SizeIs(1)) << "Mismatched names for subframe!";
 }
 
 }  // namespace content