GrAtlas refactor: Replace GrMaskFormat usage in GrAtlas with GrPixelConfig.

This gets the font-specific GrMaskFormat out of GrAtlas and replaces it with
more generic configs, allowing GrAtlas to be used for other things.

R=robertphillips@google.com

Author: jvanverth@google.com

Review URL: https://chromiumcodereview.appspot.com/24751003

git-svn-id: http://skia.googlecode.com/svn/trunk@11474 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/src/gpu/GrTextStrike.h b/src/gpu/GrTextStrike.h
index 7771e4a..66bbb0d 100644
--- a/src/gpu/GrTextStrike.h
+++ b/src/gpu/GrTextStrike.h
@@ -65,7 +65,7 @@
     GrAtlasMgr*     fAtlasMgr;
     GrAtlas*        fAtlas;     // linklist
 
-    GrMaskFormat fMaskFormat;
+    GrMaskFormat    fMaskFormat;
 
     GrGlyph* generateGlyph(GrGlyph::PackedID packed, GrFontScaler* scaler);
     // returns true if after the purge, the strike is empty