Have multiple plotmgrs, one for each mask format.
Only flush/purge those strikes that match our format.

R=bsalomon@google.com

Review URL: https://codereview.chromium.org/24047005

git-svn-id: http://skia.googlecode.com/svn/trunk@11303 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/src/gpu/GrAtlas.h b/src/gpu/GrAtlas.h
index 01a639d..e4472e7 100644
--- a/src/gpu/GrAtlas.h
+++ b/src/gpu/GrAtlas.h
@@ -82,7 +82,7 @@
 private:
     GrGpu*      fGpu;
     GrTexture*  fTexture[kCount_GrMaskFormats];
-    GrPlotMgr*  fPlotMgr;
+    GrPlotMgr*  fPlotMgr[kCount_GrMaskFormats];
 };
 
 #endif