make allocPixels throw on failure

tests/WritePixelsTest.cpp

 /*
  * Copyright 2011 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkBitmapDevice.h"
 #include "SkCanvas.h"
 #include "SkColorPriv.h"
@@ skipping 97 matching lines @@
         r = SkMulDiv255Ceiling(r, a);
         g = SkMulDiv255Ceiling(g, a);
         b = SkMulDiv255Ceiling(b, a);
     }
     return packColorType(ct, a, r, g , b);
 }
 
 static void fillCanvas(SkCanvas* canvas) {
     SkBitmap bmp;
     if (bmp.isNull()) {
-        SkDEBUGCODE(bool alloc = ) bmp.allocN32Pixels(DEV_W, DEV_H);
-        SkASSERT(alloc);
+        bmp.allocN32Pixels(DEV_W, DEV_H);
         for (int y = 0; y < DEV_H; ++y) {
             for (int x = 0; x < DEV_W; ++x) {
                 *bmp.getAddr32(x, y) = getCanvasColor(x, y);
             }
         }
     }
     canvas->save();
     canvas->setMatrix(SkMatrix::I());
     canvas->clipRect(DEV_RECT_S, SkRegion::kReplace_Op);
     SkPaint paint;
@@ skipping 342 matching lines @@
                         SkIRect writeRect = SkIRect::MakeXYWH(rect.fLeft, rect.fTop,
                                                               bmp.width(), bmp.height());
                         bool intersects = SkIRect::Intersects(canvasRect, writeRect) ;
                         REPORTER_ASSERT(reporter, intersects == (idBefore != idAfter));
                     }
                 }
             }
         }
     }
 }