Update help in SkFlags.

Print the short name in addition to the standard name.

Allow an option for getting help for a specific command.

Review URL: https://codereview.chromium.org/12411007

git-svn-id: http://skia.googlecode.com/svn/trunk@8273 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/tools/SkFlags.h b/tools/SkFlags.h
index 79cc878..a2d4c97 100644
--- a/tools/SkFlags.h
+++ b/tools/SkFlags.h
@@ -298,6 +298,8 @@
 
     const SkString& name() const { return fName; }
 
+    const SkString& shortName() const { return fShortName; }
+
     const SkString& help() const { return fHelpString; }
 
     SkString defaultValue() const {