Correct blitmask procs to recognize that we pass them an SkColor, and if they
want a SkPMColor, they need to call SkPreMultiplyColor()

Add Opaque and Black optimizations for blitmask_d32



git-svn-id: http://skia.googlecode.com/svn/trunk@911 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/src/core/SkCoreBlitters.h b/src/core/SkCoreBlitters.h
index 5a407d6..b8724c2 100644
--- a/src/core/SkCoreBlitters.h
+++ b/src/core/SkCoreBlitters.h
@@ -101,7 +101,8 @@
     virtual const SkBitmap* justAnOpaqueColor(uint32_t*);
 
 protected:
-    SkColor                fPMColor;
+    SkColor                fColor;
+    SkPMColor              fPMColor;
     SkBlitRow::ColorProc   fColor32Proc;
     SkBlitMask::Proc       fBlitMaskProc;