Add benchmark for case conversion.

The base benchmarks using ICU4C are as follows.

          _toLowerCaseAsciiUs 11.28 ====================
          _toUpperCaseAsciiUS 11.15 ====================
       _toUpperCaseLat1SuplFr 12.27 ======================
        _toUpperCaseLatExtACz 13.92 =========================
    _toUpperCaseLatExtBPinyin 16.35 ==============================

Temporarily changing ICU.toUpperCase to call
icu.lang.UCharacter.toUpperCase

          _toLowerCaseAsciiUs  11.19 ===
          _toUpperCaseAsciiUS  17.33 ====
       _toUpperCaseLat1SuplFr  40.18 ===========
        _toUpperCaseLatExtACz  69.09 ===================
    _toUpperCaseLatExtBPinyin 108.47 ==============================

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Change-Id: I58c2404d03e539c4c8732bd5238022ec66712a31
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