Use +- 2B for unbounded draw ops.

src/core/SkTileGrid.cpp

 /*
  * Copyright 2012 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkTileGrid.h"
 
 SkTileGrid::SkTileGrid(int xTiles, int yTiles, const SkTileGridFactory::TileGridInfo& info)
     : fXTiles(xTiles)
     , fYTiles(yTiles)
     , fInfo(info)
     , fCount(0)
     , fTiles(SkNEW_ARRAY(SkTDArray<unsigned>, xTiles * yTiles)) {
     // Margin is offset by 1 as a provision for AA and
     // to cancel-out the outset applied by getClipDeviceBounds.
     fInfo.fMargin.fHeight++;
     fInfo.fMargin.fWidth++;
 }
 
 SkTileGrid::~SkTileGrid() {
     SkDELETE_ARRAY(fTiles);
 }
 
 void SkTileGrid::insert(unsigned opIndex, const SkRect& fbounds, bool) {
     SkASSERT(!fbounds.isEmpty());
+
     SkIRect dilatedBounds;
-    if (fbounds.isLargest()) {
-        // Dilating the largest SkIRect will overflow.  Other nearly-largest rects may overflow too,
-        // but we don't make active use of them like we do the largest.
-        dilatedBounds.setLargest();
-    } else {
-        fbounds.roundOut(&dilatedBounds);
-        dilatedBounds.outset(fInfo.fMargin.width(), fInfo.fMargin.height());
-        dilatedBounds.offset(fInfo.fOffset);
-    }
+    fbounds.roundOut(&dilatedBounds);
+    dilatedBounds.outset(fInfo.fMargin.width(), fInfo.fMargin.height());
+    dilatedBounds.offset(fInfo.fOffset);
 
     const SkIRect gridBounds =
         { 0, 0, fInfo.fTileInterval.width() * fXTiles, fInfo.fTileInterval.height() * fYTiles };
     if (!SkIRect::Intersects(dilatedBounds, gridBounds)) {
         return;
     }
 
     // Note: SkIRects are non-inclusive of the right() column and bottom() row,
     // hence the "-1"s in the computations of maxX and maxY.
     int minX = SkMax32(0, SkMin32(dilatedBounds.left() / fInfo.fTileInterval.width(), fXTiles - 1));
@@ skipping 97 matching lines @@
         }
     }
 }
 
 void SkTileGrid::clear() {
     for (int i = 0; i < fXTiles * fYTiles; i++) {
         fTiles[i].reset();
     }
 }