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..8e929815157bca518ed896be97dfd1dfac95e529 100644
--- a/ui/touch_selection/touch_handle_unittest.cc
+++ b/ui/touch_selection/touch_handle_unittest.cc
@@ -15,7 +15,7 @@ namespace ui {
 namespace {
 
 const int kDefaultTapTimeoutMs = 200;
-const float kDefaultTapSlop = 10.f;
+const double kDefaultTapSlop = 10.;
 const float kDefaultDrawableSize = 10.f;
 
 struct MockDrawableData {
@@ -74,20 +74,25 @@ 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;
   }
 
+  bool IsWithinTapSlop(const gfx::Vector2dF& delta) const override {
+    return delta.LengthSquared() < (kDefaultTapSlop * kDefaultTapSlop);
+  }
+
   void OnHandleTapped(const TouchHandle& handle) override { tapped_ = true; }
 
   void SetNeedsAnimate() override { needs_animate_ = true; }
@@ -100,8 +105,6 @@ class TouchHandleTest : public testing::Test, public TouchHandleClient {
     return base::TimeDelta::FromMilliseconds(kDefaultTapTimeoutMs);
   }
 
-  float GetTapSlop() const override { return kDefaultTapSlop; }
-
   void Animate(TouchHandle& handle) {
     needs_animate_ = false;
     base::TimeTicks now = base::TimeTicks::Now();