Rollback text allocation changes.

This also addresses an inadvertantly introduced distance field bug.

BUG=399125
R=bsalomon@google.com

Author: jvanverth@google.com

Review URL: https://codereview.chromium.org/438683006
diff --git a/src/gpu/GrBitmapTextContext.h b/src/gpu/GrBitmapTextContext.h
index 84b7f37..6d4ea6d 100644
--- a/src/gpu/GrBitmapTextContext.h
+++ b/src/gpu/GrBitmapTextContext.h
@@ -45,6 +45,8 @@
     };
 
     void*                       fVertices;
+    int32_t                     fMaxVertices;
+    GrTexture*                  fCurrTexture;
     SkAutoTUnref<GrEffect>      fCachedEffect;
     // Used to check whether fCachedEffect is still valid.
     uint32_t                    fEffectTextureUniqueID;