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Adding code to calculate Underline Thickness from Font Metrics, this will be useful when Skia is used with Blink/Chrome. Blink changes are uploaded with code change in patch https://codereview.chromium.org/147703002/

BUG=skia:
R=reed@android.com, edisonn@google.com, reed@google.com, mtklein@google.com, mtklein@chromium.org, bungeman@google.com

Author: h.joshi@samsung.com

Review URL: https://codereview.chromium.org/152073003

git-svn-id: http://skia.googlecode.com/svn/trunk@13635 2bbb7eff-a529-9590-31e7-b0007b416f81