remove/deprecate SkBitmap::getTexture, as it now always returns false

src/core/SkSpecialImage.cpp

 /*
  * Copyright 2016 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file
  */
 
 #include "SkSpecialImage.h"
 #include "SkBitmap.h"
 #include "SkImage.h"
@@ skipping 272 matching lines @@
 
 private:
     SkBitmap fBitmap;
 
     typedef SkSpecialImage_Base INHERITED;
 };
 
 sk_sp<SkSpecialImage> SkSpecialImage::MakeFromRaster(const SkIRect& subset,
                                                      const SkBitmap& bm,
                                                      const SkSurfaceProps* props) {
-    SkASSERT(nullptr == bm.getTexture());
     SkASSERT(rect_fits(subset, bm.width(), bm.height()));
 
     const SkBitmap* srcBM = &bm;
     SkBitmap tmpStorage;
     // ImageFilters only handle N32 at the moment, so force our src to be that
     if (!valid_for_imagefilters(bm.info())) {
         if (!bm.copyTo(&tmpStorage, kN32_SkColorType)) {
             return nullptr;
         }
         srcBM = &tmpStorage;
@@ skipping 142 matching lines @@
                                                   sk_sp<GrTexture> tex,
                                                   sk_sp<SkColorSpace> colorSpace,
                                                   const SkSurfaceProps* props,
                                                   SkAlphaType at) {
     SkASSERT(rect_fits(subset, tex->width(), tex->height()));
     return sk_make_sp<SkSpecialImage_Gpu>(subset, uniqueID, std::move(tex), at,
                                           std::move(colorSpace), props);
 }
 
 #endif