MacViews: Fix vertical alignment of text rendering.

NSFont returns fractional values for font metrics. We were truncating the
values, causing text to appear too high vertically. The fix is to apply the
ceiling function instead.

BUG=401345

Review URL: https://codereview.chromium.org/445363006

Cr-Commit-Position: refs/heads/master@{#288479}
git-svn-id: svn://svn.chromium.org/chrome/trunk/src@288479 0039d316-1c4b-4281-b951-d872f2087c98

ui/gfx/platform_font_mac.mm

@@ -166,9 +166,9 @@ void PlatformFontMac::CalculateMetrics() {
 
   base::scoped_nsobject<NSLayoutManager> layout_manager(
       [[NSLayoutManager alloc] init]);
-  height_ = [layout_manager defaultLineHeightForFont:font];
-  ascent_ = [font ascender];
-  cap_height_ = [font capHeight];
+  height_ = SkScalarCeilToInt([layout_manager defaultLineHeightForFont:font]);
+  ascent_ = SkScalarCeilToInt([font ascender]);
+  cap_height_ = SkScalarCeilToInt([font capHeight]);
   average_width_ =
       NSWidth([font boundingRectForGlyph:[font glyphWithName:@"x"]]);
 }