Ensure async selections after longpress activate the handles

ui/touch_selection/touch_selection_controller.cc

 // Copyright 2014 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 "ui/touch_selection/touch_selection_controller.h"
 
 #include "base/auto_reset.h"
 #include "base/logging.h"
 #include "base/metrics/histogram_macros.h"
 
@@ skipping 473 matching lines @@
   DCHECK(start_selection_handle_);
   DCHECK(end_selection_handle_);
   LogSelectionEnd();
   start_selection_handle_->SetEnabled(false);
   end_selection_handle_->SetEnabled(false);
   active_status_ = INACTIVE;
   client_->OnSelectionEvent(SELECTION_CLEARED);
 }
 
 void TouchSelectionController::ForceNextUpdateIfInactive() {
-  if (active_status_ == INACTIVE)
+  // Only force the update if the reported selection is non-empty but still
+  // considered "inactive", i.e., it wasn't preceded by a user gesture or
+  // the handles have since been explicitly hidden.
+  if (active_status_ == INACTIVE &&
+      start_.type() != SelectionBound::EMPTY &&
+      end_.type() != SelectionBound::EMPTY) {
     force_next_update_ = true;
+  }
 }
 
 gfx::Vector2dF TouchSelectionController::GetStartLineOffset() const {
   return ComputeLineOffsetFromBottom(start_);
 }
 
 gfx::Vector2dF TouchSelectionController::GetEndLineOffset() const {
   return ComputeLineOffsetFromBottom(end_);
 }
 
@@ skipping 21 matching lines @@
     base::TimeDelta duration = base::TimeTicks::Now() - selection_start_time_;
     UMA_HISTOGRAM_CUSTOM_TIMES("Event.TouchSelection.WasDraggedDuration",
                                duration,
                                base::TimeDelta::FromMilliseconds(500),
                                base::TimeDelta::FromSeconds(60),
                                60);
   }
 }
 
 }  // namespace ui