Support longpress drag selection

ui/events/test/motion_event_test_utils.h

Index: ui/events/test/motion_event_test_utils.h
diff --git a/ui/events/test/motion_event_test_utils.h b/ui/events/test/motion_event_test_utils.h
index 9b83fdc7a02f57a9d6995c6b6a3f80cd0c2f6b73..4a32d2fbe4929946998935b0afc7ed808e60b53f 100644
--- a/ui/events/test/motion_event_test_utils.h
+++ b/ui/events/test/motion_event_test_utils.h
@@ -44,14 +44,14 @@ struct MockMotionEvent : public MotionEventGeneric {
   ~MockMotionEvent() override;
 
   // Utility methods.
-  void PressPoint(float x, float y);
-  void MovePoint(size_t index, float x, float y);
-  void ReleasePoint();
-  void CancelPoint();
-  void SetTouchMajor(float new_touch_major);
-  void SetRawOffset(float raw_offset_x, float raw_offset_y);
-  void SetToolType(size_t index, ToolType tool_type);
-  void SetPrimaryPointerId(int id);
+  MockMotionEvent& PressPoint(float x, float y);
+  MockMotionEvent& MovePoint(size_t index, float x, float y);
+  MockMotionEvent& ReleasePoint();
+  MockMotionEvent& CancelPoint();
+  MockMotionEvent& SetTouchMajor(float new_touch_major);
+  MockMotionEvent& SetRawOffset(float raw_offset_x, float raw_offset_y);
+  MockMotionEvent& SetToolType(size_t index, ToolType tool_type);
+  MockMotionEvent& SetPrimaryPointerId(int id);
 

[sadrul, 2015/05/14 22:44:36]

Interesting. I haven't seen this pattern used elsewhere in chrome ... are there
any?

[jdduke (slow), 2015/05/14 22:49:46]

Isn't this pretty common with builder objects (confessedly I haven't actually
used builders much in Chrome...)? Otherwise I haven't seen it used much either.
Regardless, it's convenient, and in tests it's sometimes fun to rebel against
conformity ;).

[sadrul, 2015/05/14 22:55:32]

Not sure. I don't think we have that many builders [that do this] in chrome. But
yeah, I quite like this.

  private:
   void PushPointer(float x, float y);