Refactor TouchSelectionDraggableClient APIs

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 6f04b209fe27b38c1e906daf805080ce08434bc3..8d6c321b4de6e3076903c88425c1527634dd2879 100644
--- a/ui/touch_selection/touch_handle_unittest.cc
+++ b/ui/touch_selection/touch_handle_unittest.cc
@@ -84,19 +84,22 @@ class TouchHandleTest : public testing::Test, public TouchHandleClient {
   ~TouchHandleTest() override {}
 
   // TouchHandleClient implementation.
-  void OnDragBegin(const TouchSelectionDraggable& handler,
-                   const gfx::PointF& drag_position) override {
-    dragging_ = true;
-  }
-
-  void OnDragUpdate(const TouchSelectionDraggable& handler,
-                    const gfx::PointF& drag_position) override {
-    dragged_ = true;
-    drag_position_ = drag_position;
-  }
-
-  void OnDragEnd(const TouchSelectionDraggable& handler) override {
-    dragging_ = false;
+  void OnDragEvent(const TouchHandleDragEvent event,
+                   const TouchSelectionDraggable& draggable,
+                   const gfx::PointF& position) override {
+    switch (event) {
+      case HANDLE_DRAG_BEGIN:
+        dragging_ = true;
+        break;
+      case HANDLE_DRAG_UPDATE:
+        dragged_ = true;
+        drag_position_ = position;
+        break;
+      case HANDLE_DRAG_END:
+        dragging_ = false;
+      default:
+        NOTREACHED() << "Invalid handle drag event";
+    }
   }
 
   bool IsWithinTapSlop(const gfx::Vector2dF& delta) const override {