RFR: 8233477 [Win LAF]The tooltip doesn't display correctly in Win LAF [v4]

[Tejesh R]

> In Button ToolTip, Mnemonic key string was shown only in Metal Look and Feel, since the feature is implemented in it. In other L&F especially Windows L&F the feature is not available. In order to make it available for other L&F's, the getAcceleratedString method and calculateAcceleratedStringSpace method is Implemented in ToolTipUI class. These methods are used in BasicToolTipUI class which uses the feature and shows/paints the ToolTip String along with the set Mnemonic key. In similar way other L&F which doesn't Inherit BasicToolTipUI can make use of the feature available in ToolTipUI.

Tejesh R has updated the pull request incrementally with one additional commit since the last revision:

  Removed the test from open, updated in closed

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Changes:
  - all: https://git.openjdk.java.net/jdk/pull/8496/files
  - new: https://git.openjdk.java.net/jdk/pull/8496/files/143be931..b81138b8

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=8496&range=03
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=8496&range=02-03

  Stats: 227 lines in 1 file changed: 0 ins; 227 del; 0 mod
  Patch: https://git.openjdk.java.net/jdk/pull/8496.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/8496/head:pull/8496

PR: https://git.openjdk.java.net/jdk/pull/8496