OSR: Wheel scrolling defect

Issue #2895 resolved
Mike Wiedenbauer created an issue
  1. ./cefclient --off-screen-rendering-enabled
  2. Expected: smooth scrolling takes place | Actual: Very jumpy scrolling, afterwards even SB drag scrolling isn’t possible
  3. M80, M81 ubuntu 18.04LTS
  4. Yes, reproducible with cefclient OSR mode
  5. No

From analysis CefBrowserPlatformDelegateNativeAura::TranslateUiWheelEvent() needs to pass ui::EF_PRECISION_SCROLLING_DELTA additionally to the flags.

Attached a patch for the proposed fix.

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