Support longpress drag selection

ui/touch_selection/touch_handle_unittest.cc

Index: ui/touch_selection/touch_handle_unittest.cc
diff --git a/ui/touch_selection/touch_handle_unittest.cc b/ui/touch_selection/touch_handle_unittest.cc
index e86c3d3881b245953f17aa8621166e934718b1dc..dedd85d51f2a5ced7a287a22f6a3a168feb7ccf0 100644
--- a/ui/touch_selection/touch_handle_unittest.cc
+++ b/ui/touch_selection/touch_handle_unittest.cc
@@ -74,17 +74,18 @@ class TouchHandleTest : public testing::Test, public TouchHandleClient {
   ~TouchHandleTest() override {}
 
   // TouchHandleClient implementation.
-  void OnHandleDragBegin(const TouchHandle& handle) override {
+  void OnDragBegin(const TouchSelectionDraggable& handler,
+                   const gfx::PointF& drag_position) override {
     dragging_ = true;
   }
 
-  void OnHandleDragUpdate(const TouchHandle& handle,
-                          const gfx::PointF& new_position) override {
+  void OnDragUpdate(const TouchSelectionDraggable& handler,
+                    const gfx::PointF& drag_position) override {
     dragged_ = true;
-    drag_position_ = new_position;
+    drag_position_ = drag_position;
   }
 
-  void OnHandleDragEnd(const TouchHandle& handle) override {
+  void OnDragEnd(const TouchSelectionDraggable& handler) override {
     dragging_ = false;
   }