Reland: Implement Aura side of unified touch text selection for contents

ui/touch_selection/touch_selection_controller.cc

Index: ui/touch_selection/touch_selection_controller.cc
diff --git a/ui/touch_selection/touch_selection_controller.cc b/ui/touch_selection/touch_selection_controller.cc
index 71dcce80c0807b1262b2429d5d67912e1ce3140c..a2e719223b956d3874bd555fd4a9924816c1eb70 100644
--- a/ui/touch_selection/touch_selection_controller.cc
+++ b/ui/touch_selection/touch_selection_controller.cc
@@ -66,11 +66,11 @@ TouchSelectionController::TouchSelectionController(
 TouchSelectionController::~TouchSelectionController() {
 }
 
-void TouchSelectionController::OnSelectionBoundsChanged(
+bool TouchSelectionController::OnSelectionBoundsUpdated(
     const SelectionBound& start,
     const SelectionBound& end) {
   if (start == start_ && end_ == end)
-    return;
+    return false;
 
   start_ = start;
   end_ = end;
@@ -80,7 +80,7 @@ void TouchSelectionController::OnSelectionBoundsChanged(
   if (!activate_selection_automatically_ &&
       !activate_insertion_automatically_) {
     DCHECK_EQ(INPUT_EVENT_TYPE_NONE, response_pending_input_event_);
-    return;
+    return false;
   }
 
   // Ensure that |response_pending_input_event_| is cleared after the method
@@ -113,16 +113,17 @@ void TouchSelectionController::OnSelectionBoundsChanged(
        start_orientation_ != TouchHandleOrientation::UNDEFINED &&
        end_orientation_ != TouchHandleOrientation::UNDEFINED)) {
     OnSelectionChanged();
-    return;
+    return true;
   }
 
   if (start_orientation_ == TouchHandleOrientation::CENTER &&
       selection_editable_) {
     OnInsertionChanged();
-    return;
+    return true;
   }
 
   HideAndDisallowShowingAutomatically();
+  return true;
 }
 
 bool TouchSelectionController::WillHandleTouchEvent(const MotionEvent& event) {