Fixed bad bitmap size crashes

src/effects/SkXfermodeImageFilter.cpp

 /*
  * Copyright 2013 The Android Open Source Project
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkXfermodeImageFilter.h"
 #include "SkCanvas.h"
 #include "SkDevice.h"
@@ skipping 54 matching lines @@
     background.getBounds(&bounds);
     if (!applyCropRect(&bounds, ctm)) {
         return false;
     }
     backgroundOffset.fX -= bounds.left();
     backgroundOffset.fY -= bounds.top();
     foregroundOffset.fX -= bounds.left();
     foregroundOffset.fY -= bounds.top();
 
     SkAutoTUnref<SkBaseDevice> device(proxy->createDevice(bounds.width(), bounds.height()));
+    if (NULL == device.get()) {
+        return false;
+    }
     SkCanvas canvas(device);
     SkPaint paint;
     paint.setXfermodeMode(SkXfermode::kSrc_Mode);
     canvas.drawBitmap(background, SkIntToScalar(backgroundOffset.fX),
                       SkIntToScalar(backgroundOffset.fY), &paint);
     paint.setXfermode(fMode);
     canvas.drawBitmap(foreground, SkIntToScalar(foregroundOffset.fX),
                       SkIntToScalar(foregroundOffset.fY), &paint);
     *dst = device->accessBitmap(false);
     offset->fX += bounds.left();
@@ skipping 64 matching lines @@
         foregroundPaint.setBlendFunc(sk_blend_to_grblend(sm), sk_blend_to_grblend(dm));
         foregroundPaint.addColorTextureEffect(foregroundTex, foregroundMatrix);
         context->drawRect(foregroundPaint, srcRect);
     }
     offset->fX += backgroundOffset.fX;
     offset->fY += backgroundOffset.fY;
     return SkImageFilterUtils::WrapTexture(dst, src.width(), src.height(), result);
 }
 
 #endif