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

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 48 matching lines @@
       selection_empty_(false),
       selection_editable_(false),
       temporarily_hidden_(false),
       selection_handle_dragged_(false) {
   DCHECK(client_);
 }
 
 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;
   start_orientation_ = ToTouchHandleOrientation(start_.type());
   end_orientation_ = ToTouchHandleOrientation(end_.type());
 
   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
   // completes, while also making its current value available for the duration
   // of the call.
   InputEventType causal_input_event = response_pending_input_event_;
   response_pending_input_event_ = INPUT_EVENT_TYPE_NONE;
   base::AutoReset<InputEventType> auto_reset_response_pending_input_event(
       &response_pending_input_event_, causal_input_event);
 
@@ skipping 12 matching lines @@
       start_orientation_ = start_selection_handle_->orientation();
     if (end_orientation_ == TOUCH_HANDLE_CENTER)
       end_orientation_ = end_selection_handle_->orientation();
   }
 
   if (GetStartPosition() != GetEndPosition() ||
       (is_selection_dragging &&
        start_orientation_ != TOUCH_HANDLE_ORIENTATION_UNDEFINED &&
        end_orientation_ != TOUCH_HANDLE_ORIENTATION_UNDEFINED)) {
     OnSelectionChanged();
-    return;
+    return true;
   }
 
   if (start_orientation_ == TOUCH_HANDLE_CENTER && selection_editable_) {
     OnInsertionChanged();
-    return;
+    return true;
   }
 
   HideAndDisallowShowingAutomatically();
+  return true;
 }
 
 bool TouchSelectionController::WillHandleTouchEvent(const MotionEvent& event) {
   if (is_insertion_active_) {
     DCHECK(insertion_handle_);
     return insertion_handle_->WillHandleTouchEvent(event);
   }
 
   if (is_selection_active_) {
     DCHECK(start_selection_handle_);
@@ skipping 330 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