RFR: 8237833: Check glyph size before adding to glyph texture cache

[Phil Race]

Check if the glyph will fit before trying to cache it.

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Commits:
 - fbfb2473: 8237833: Check glyph size before adding to glyph texture cache

Changes: https://git.openjdk.java.net/jfx/pull/96/files
 Webrev: https://webrevs.openjdk.java.net/jfx/96/webrev.00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8237833
  Stats: 9 lines in 1 file changed: 7 ins; 0 del; 2 mod
  Patch: https://git.openjdk.java.net/jfx/pull/96.diff
  Fetch: git fetch https://git.openjdk.java.net/jfx pull/96/head:pull/96

PR: https://git.openjdk.java.net/jfx/pull/96