Fixed bad bitmap size crashes

src/effects/SkDropShadowImageFilter.cpp

 /*
  * Copyright 2013 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkDropShadowImageFilter.h"
 
 #include "SkBitmap.h"
@@ skipping 52 matching lines @@
     if (getInput(0) && !getInput(0)->filterImage(proxy, source, matrix, &src, loc))
         return false;
 
     SkIRect bounds;
     src.getBounds(&bounds);
     if (!this->applyCropRect(&bounds, matrix)) {
         return false;
     }
 
     SkAutoTUnref<SkBaseDevice> device(proxy->createDevice(bounds.width(), bounds.height()));
+    if (NULL == device.get()) {
+        return false;
+    }
     SkCanvas canvas(device.get());
 
     SkAutoTUnref<SkImageFilter> blurFilter(new SkBlurImageFilter(fSigmaX, fSigmaY));
     SkAutoTUnref<SkColorFilter> colorFilter(SkColorFilter::CreateModeFilter(fColor, SkXfermode::kSrcIn_Mode));
     SkPaint paint;
     paint.setImageFilter(blurFilter.get());
     paint.setColorFilter(colorFilter.get());
     paint.setXfermodeMode(SkXfermode::kSrcOver_Mode);
     canvas.translate(-SkIntToScalar(bounds.fLeft), -SkIntToScalar(bounds.fTop));
     canvas.drawBitmap(src, fDx, fDy, &paint);
     canvas.drawBitmap(src, 0, 0);
     *result = device->accessBitmap(false);
     loc->fX += bounds.fLeft;
     loc->fY += bounds.fTop;
     return true;
 }