Temporary fix for --preAbandonGpuContext bug

src/effects/SkMorphologyImageFilter.cpp

 /*
  * Copyright 2012 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 "SkMorphologyImageFilter.h"
 
 #include "SkBitmap.h"
@@ skipping 533 matching lines @@
     SkIRect srcBounds = bounds;
     srcBounds.offset(-inputOffset);
 
     if (0 == width && 0 == height) {
         offset->fX = bounds.left();
         offset->fY = bounds.top();
         return input->makeSubset(srcBounds);
     }
 
 #if SK_SUPPORT_GPU
-    if (input->peekTexture()) {
+    if (input->peekTexture() && input->peekTexture()->getContext()) {
         auto type = dilate ? GrMorphologyEffect::kDilate_MorphologyType
                            : GrMorphologyEffect::kErode_MorphologyType;
         sk_sp<SkSpecialImage> result(apply_morphology(input.get(), srcBounds, type,
                                                       SkISize::Make(width, height)));
         if (result) {
             offset->fX = bounds.left();
             offset->fY = bounds.top();
         }
         return result;
     }
@@ skipping 61 matching lines @@
 sk_sp<SkSpecialImage> SkDilateImageFilter::onFilterImage(SkSpecialImage* source, const Context& ctx,
                                                          SkIPoint* offset) const {
     return this->filterImageGeneric(true, source, ctx, offset);
 }
 
 sk_sp<SkSpecialImage> SkErodeImageFilter::onFilterImage(SkSpecialImage* source, const Context& ctx,
                                                         SkIPoint* offset) const {
     return this->filterImageGeneric(false, source, ctx, offset);
 }