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

ui/touch_selection/touch_selection_controller.h

Index: ui/touch_selection/touch_selection_controller.h
diff --git a/ui/touch_selection/touch_selection_controller.h b/ui/touch_selection/touch_selection_controller.h
index 2bcefbd20542c1a12477ccb93ed6eec25fc7a8ea..e144f632fed18a0b3d82b41c0c28b3cf4b98e704 100644
--- a/ui/touch_selection/touch_selection_controller.h
+++ b/ui/touch_selection/touch_selection_controller.h
@@ -38,13 +38,14 @@ class UI_TOUCH_SELECTION_EXPORT TouchSelectionController
  public:
   TouchSelectionController(TouchSelectionControllerClient* client,
                            base::TimeDelta tap_timeout,
-                           float tap_slop);
+                           float tap_slop,
+                           bool show_on_tap_for_empty_editable);
   ~TouchSelectionController() override;
 
-  // To be called when the selection bounds have changed.
+  // To be called when the selection bounds info has been updated.
   // Note that such updates will trigger handle updates only if preceded
   // by an appropriate call to allow automatic showing.
-  void OnSelectionBoundsChanged(const SelectionBound& start,
+  void OnSelectionBoundsUpdated(const SelectionBound& start,
                                 const SelectionBound& end);
 
   // Allows touch-dragging of the handle.
@@ -81,7 +82,17 @@ class UI_TOUCH_SELECTION_EXPORT TouchSelectionController
   // Returns true if an animation is active and requires further ticking.
   bool Animate(base::TimeTicks animate_time);
 
+  void TryActivateSelection();
+
+  const SelectionBound& start() const { return start_; }
+  const SelectionBound& end() const { return end_; }
+
+  bool is_insertion_active() const { return is_insertion_active_; }
+  bool is_selection_active() const { return is_selection_active_; }
+
  private:
+  friend class TouchSelectionControllerAuraTest;
+
   enum InputEventType { TAP, LONG_PRESS, INPUT_EVENT_TYPE_NONE };
 
   // TouchHandleClient implementation.
@@ -115,10 +126,18 @@ class UI_TOUCH_SELECTION_EXPORT TouchSelectionController
   bool GetEndVisible() const;
   TouchHandle::AnimationStyle GetAnimationStyle(bool was_active) const;
 
+  TouchHandle* insertion_handle_for_testing() const {
+    return insertion_handle_.get();
+  }
+
   TouchSelectionControllerClient* const client_;
   const base::TimeDelta tap_timeout_;
   const float tap_slop_;
 
+  // Controls whether an insertion handle is shown on a tap for an empty
+  // editable selection.
+  bool show_on_tap_for_empty_editable_;
+
   InputEventType response_pending_input_event_;
 
   SelectionBound start_;