Supports the cap height for FreeType even when TT OS2 version is 1.

include/core/SkPaint.h

Index: include/core/SkPaint.h
diff --git a/include/core/SkPaint.h b/include/core/SkPaint.h
index 1244795819063cee64fb86f042bacfef9fa76843..7ccadb0cd3bd5a2121cff7e7dd52276be2715290 100644
--- a/include/core/SkPaint.h
+++ b/include/core/SkPaint.h
@@ -740,7 +740,8 @@ public:
         SkScalar    fMaxCharWidth;  //!< the max charactor width (>= 0)
         SkScalar    fXMin;      //!< The minimum bounding box x value for all glyphs
         SkScalar    fXMax;      //!< The maximum bounding box x value for all glyphs
-        SkScalar    fXHeight;   //!< the height of an 'x' in px, or 0 if no 'x' in face
+        SkScalar    fXHeight;   //!< The height of an 'x' in px, or 0 if no 'x' in face
+        SkScalar    fCapHeight;  //!< The cap height (will be => 0)

[bungeman-skia, 2013/12/12 17:12:35]

add or '0' if cannot be determined here.

While you're currently updating the FreeType backend to basically never return
0, the others still return 0 and we should document the 'cannot be determined
value' similar to x-height.

[Yuki, 2013/12/13 09:32:14]

Done.

     };
 
     /** Return the recommend spacing between lines (which will be