RFR: 8202990: javafx webview css filter property with display scaling [v2]

[Bhawesh Choudhary]

> ImageJava.cpp ignores CompositeOperator parameter in drawImage function due to which shadow was getting drawn on top of
> actual image. apply given composite operator to graphics context before drawing image to fix this issue. another issue
> is into WCGraphicsPrismContext.java. while blending two layers, applying state to the destination layer was missed due
> to which image was not getting drawn with right scale in hidpi mode. apply state to fix the issue.

Bhawesh Choudhary has updated the pull request incrementally with one additional commit since the last revision:

  Moved test from unit test to system test

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Changes:
  - all: https://git.openjdk.java.net/jfx/pull/279/files
  - new: https://git.openjdk.java.net/jfx/pull/279/files/91e8bdf0..a99141df

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jfx&pr=279&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=jfx&pr=279&range=00-01

  Stats: 211 lines in 3 files changed: 185 ins; 26 del; 0 mod
  Patch: https://git.openjdk.java.net/jfx/pull/279.diff
  Fetch: git fetch https://git.openjdk.java.net/jfx pull/279/head:pull/279

PR: https://git.openjdk.java.net/jfx/pull/279