Revert of change SkDraw and all Blitters to use pixmap instead of bitmap

src/gpu/GrSWMaskHelper.h

Index: src/gpu/GrSWMaskHelper.h
diff --git a/src/gpu/GrSWMaskHelper.h b/src/gpu/GrSWMaskHelper.h
index b90205b1a1e93afbb882c51d5c698d93255bb309..a69e4bec991f353d8424cc8d7ddaa97543966f22 100644
--- a/src/gpu/GrSWMaskHelper.h
+++ b/src/gpu/GrSWMaskHelper.h
@@ -69,7 +69,7 @@
     
     // Reset the internal bitmap
     void clear(uint8_t alpha) {
-        fPixels.erase(SkColorSetARGB(alpha, 0xFF, 0xFF, 0xFF));
+        fBM.eraseColor(SkColorSetARGB(alpha, alpha, alpha, alpha));
     }
 
     // Canonical usage utility that draws a single path and uploads it
@@ -105,7 +105,7 @@
 
     GrContext*      fContext;
     SkMatrix        fMatrix;
-    SkAutoPixmapStorage fPixels;
+    SkBitmap        fBM;
     SkDraw          fDraw;
     SkRasterClip    fRasterClip;