Tong Mu fb0b982324
Change MouseTracker's interface for clarity. Simplify MouseRegion's implementation. (#64119)
* Redesigns the interface between MouseTracker and RendererBinding&RenderView.
* Simplifies the structure of RenderMouseRegion.
* Extracts the common utility code between mouse_tracker_test and mouse_tracker_cursor_test.
2020-08-19 18:51:56 -07:00
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