Add SkFontDescriptor for serializing fonts.

Add SkFontDescriptor for serializing fonts.
Committed: https://code.google.com/p/skia/source/detail?r=4106

[DerekS, 2012-05-31 13:37:05]

Here is the initial header that I was thinking of

[reed1, 2012-05-31 13:48:18]

its possible that we will want to make the read/write helpers be a little
lower-level in the future (i.e just serialize to a byte-array like region and
matrix), but this is good for now.

lgtm

[reed1, 2012-05-31 13:49:22]

Lets just be sure to code the read/write methods to be open-ended about the
number of type of names in our first version. This will let us added more
descriptors in the future w/o invalidating old streams... (until that is too
ugly).

[DerekS, 2012-05-31 18:46:22]

This patch set includes the completed implementation as well as updating android
and linux to use the new format.

[bungeman, 2012-05-31 19:07:37]

Other than the gyp nit, LGTM.

http://codereview.appspot.com/6250080/diff/4001/gyp/ports.gyp
File gyp/ports.gyp (right):

http://codereview.appspot.com/6250080/diff/4001/gyp/ports.gyp#newcode23
gyp/ports.gyp:23: '../src/ports/SkFontDescriptor.cpp',
'../src/ports/SkFontDescriptor.h',

makes things easier to find in IDEs.

[reed1, 2012-05-31 19:52:20]

lgtm

https://codereview.appspot.com/6250080/diff/4001/src/ports/SkFontHost_android...
File src/ports/SkFontHost_android.cpp (right):

https://codereview.appspot.com/6250080/diff/4001/src/ports/SkFontHost_android...
src/ports/SkFontHost_android.cpp:728: SkFontDescriptor descriptor;
:( do we not have the family name anywhere?
For playback on other platforms, the family name may be very useful