RFR: 8262802: Wrong context origin coordinates when using EGL and HiDPI [v2]

[Jose Pereda]

> See [issue](https://bugs.openjdk.java.net/browse/JDK-8262802) for detailed description. 
> 
> This PR solves the wrong calculations of ContextX and ContextY in ES2SwapChain when EGL is used on HiDPI devices, by using properly scaled dimensions. Without these changes, any popup control is misplaced.

Jose Pereda has updated the pull request incrementally with one additional commit since the last revision:

  Remove unnecessary spacing

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Changes:
  - all: https://git.openjdk.java.net/jfx/pull/416/files
  - new: https://git.openjdk.java.net/jfx/pull/416/files/09520338..b774eccf

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jfx&pr=416&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=jfx&pr=416&range=00-01

  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.java.net/jfx/pull/416.diff
  Fetch: git fetch https://git.openjdk.java.net/jfx pull/416/head:pull/416

PR: https://git.openjdk.java.net/jfx/pull/416