Start to vectorize SkTileGrid.

src/core/SkTileGrid.h

Index: src/core/SkTileGrid.h
diff --git a/src/core/SkTileGrid.h b/src/core/SkTileGrid.h
index fd7584fd9c6052093243b8be212c3a9ea00822e2..d556f8074b89934fb7ecd1b113148b9504f45f1c 100644
--- a/src/core/SkTileGrid.h
+++ b/src/core/SkTileGrid.h
@@ -8,6 +8,7 @@
 #ifndef SkTileGrid_DEFINED
 #define SkTileGrid_DEFINED
 
+#include "Sk4x.h"
 #include "SkBBHFactory.h"
 #include "SkBBoxHierarchy.h"
 
@@ -43,16 +44,16 @@ public:
     virtual void flushDeferredInserts() SK_OVERRIDE;
 
 private:
-    void commonAdjust(SkRect*) const;
-    void userToGrid(const SkRect&, SkIRect* grid) const;
+    void userToGrid(const Sk4f&, SkIRect*) const;
+    bool intersectsGrid(const Sk4f&) const;
 
-    const int fXTiles, fYTiles;
-    const SkScalar fInvWidth, fInvHeight;
-    const SkScalar fMarginWidth, fMarginHeight;
-    const SkPoint fOffset;
-    const SkRect  fGridBounds;
+    const int fXTiles,    // Number of tiles in a single row.
+              fNumTiles;  // Total number of tiles.
 
-    // (fXTiles * fYTiles) SkTDArrays, each listing ops overlapping that tile in order.
+    const SkRect fGridBounds;  // Only used for intersectsGrid().  Remove if that's removed.
+    const Sk4f fMargin, fOffset, fUserToGrid, fGridHigh;
+
+    // fNumTiles SkTDArrays, each listing ops overlapping that tile in order.
     SkTDArray<unsigned>* fTiles;
 
     typedef SkBBoxHierarchy INHERITED;