Fix initial hiding and centering cursor on ChromeOS

Fix initial hiding and centering cursor on ChromeOS

DisplayController::UpdateMouseLocationAfterDisplayChange() is now called during
startup:
- In Ozone once a channel to the GPU has been established
- In X11 as a result of
  DisplayChangeObserver::OnTouchscreenDeviceConfigurationChanged()

Moving the mouse on startup:
- Causes side effects such as mouse hover
- Causes a mouse event to be generated which causes
  CompoundEventFilter::SetCursorVisibilityOnEvent() to show the
  mouse cursor.

This CL makes DisplayController::UpdateMouseLocationAfterDisplayChange() move the
mouse only if necessary.

BUG=450860
TEST=Manual, see bug

Review URL: https://codereview.chromium.org/902123002

Cr-Commit-Position: refs/heads/master@{#318708}