RFR: 8233477 [Win LAF]The tooltip doesn't display correctly in Win LAF [v2]

[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 two additional commits since the last revision:

 - Feature moved to ToolTipUI and updated MetalToolTipUI Accordingly
 - Feature moved to ToolTipUI and updated MetalToolTipUI Accordingly

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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/7c46bba4..60da819c

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=8496&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=8496&range=00-01

  Stats: 121 lines in 2 files changed: 1 ins; 120 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