Modify GrBWFillRectBatch to use GrQuad

src/gpu/GrQuad.h

Index: src/gpu/GrQuad.h
diff --git a/src/gpu/GrQuad.h b/src/gpu/GrQuad.h
index fc169ead6d2b56daebf2518b520e9354c4165402..9a8d1f3a4a37a1d421b83ceb52700ce593a0391d 100644
--- a/src/gpu/GrQuad.h
+++ b/src/gpu/GrQuad.h
@@ -16,6 +16,8 @@
  */
 class GrQuad {
 public:
+    GrQuad() {}
+
     GrQuad(const GrQuad& that) {
         *this = that;
     }
@@ -50,6 +52,11 @@ public:
         return fPoints;
     }
 
+    const SkPoint& point(int i) const {
+        SkASSERT(i < kNumPoints);
+        return fPoints[i];
+    }
+
 private:
     static const int kNumPoints = 4;
     SkPoint fPoints[kNumPoints];