Add canFilterMaskGPU & filterMaskGPU to SkMaskFilter

tools/PictureRenderer.h

Index: tools/PictureRenderer.h
===================================================================
--- tools/PictureRenderer.h	(revision 9883)
+++ tools/PictureRenderer.h	(working copy)
@@ -59,13 +59,13 @@
     // this uses SkPaint::Flags as a base and adds additional flags
     enum DrawFilterFlags {
         kNone_DrawFilterFlag = 0,
-        kBlur_DrawFilterFlag = 0x8000, // toggles between blur and no blur
+        kMaskFilter_DrawFilterFlag = 0x8000, // toggles on/off mask filters (e.g., blurs)
         kHinting_DrawFilterFlag = 0x10000, // toggles between no hinting and normal hinting
         kSlightHinting_DrawFilterFlag = 0x20000, // toggles between slight and normal hinting
         kAAClip_DrawFilterFlag = 0x40000, // toggles between soft and hard clip
     };
 
-    SK_COMPILE_ASSERT(!(kBlur_DrawFilterFlag & SkPaint::kAllFlags), blur_flag_must_be_greater);
+    SK_COMPILE_ASSERT(!(kMaskFilter_DrawFilterFlag & SkPaint::kAllFlags), maskfilter_flag_must_be_greater);
     SK_COMPILE_ASSERT(!(kHinting_DrawFilterFlag & SkPaint::kAllFlags),
             hinting_flag_must_be_greater);
     SK_COMPILE_ASSERT(!(kSlightHinting_DrawFilterFlag & SkPaint::kAllFlags),