dd vhea/vmtx table support.

- Added vhea.{cc,h} and vmtx.{cc,h}.
- Added metrics.{cc,h} to integrate common functions of hhea/hmtx and vhea/vmtx.
- Moved functions in hhea.cc to metrics.cc.

BUG=77386
TEST=http://code.google.com/p/ots/wiki/HowToTestOts (verified with 3500+ font files)
TEST=test/table_dependencies_test.cc


git-svn-id: http://ots.googlecode.com/svn/trunk@61 a4e77c2c-9104-11de-800e-5b313e0d2bf3
diff --git a/ots-common.gypi b/ots-common.gypi
index f023de3..0432b4a 100644
--- a/ots-common.gypi
+++ b/ots-common.gypi
@@ -45,6 +45,8 @@
       'src/ltsh.h',
       'src/maxp.cc',
       'src/maxp.h',
+      'src/metrics.cc',
+      'src/metrics.h',
       'src/name.cc',
       'src/os2.cc',
       'src/os2.h',
@@ -56,6 +58,10 @@
       'src/prep.h',
       'src/vdmx.cc',
       'src/vdmx.h',
+      'src/vhea.cc',
+      'src/vhea.h',
+      'src/vmtx.cc',
+      'src/vmtx.h',
       'src/vorg.cc',
       'src/vorg.h',
     ],