Make SkImage::readYUV8Planes const

src/image/SkImage.cpp

 /*
  * Copyright 2012 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkBitmap.h"
 #include "SkBitmapCache.h"
 #include "SkCanvas.h"
@@ skipping 247 matching lines @@
     return this->readPixels(pmap.info(), pmap.writable_addr(), pmap.rowBytes(), srcX, srcY, chint);
 }
 
 #if SK_SUPPORT_GPU
 #include "GrTextureToYUVPlanes.h"
 #endif
 
 #include "SkRGBAToYUV.h"
 
 bool SkImage::readYUV8Planes(const SkISize sizes[3], void* const planes[3],
-                             const size_t rowBytes[3], SkYUVColorSpace colorSpace) {
+                             const size_t rowBytes[3], SkYUVColorSpace colorSpace) const {
 #if SK_SUPPORT_GPU
     if (GrTexture* texture = as_IB(this)->peekTexture()) {
         if (GrTextureToYUVPlanes(texture, sizes, planes, rowBytes, colorSpace)) {
             return true;
         }
     }
 #endif
     return SkRGBAToYUV(this, sizes, planes, rowBytes, colorSpace);
 }
 
@@ skipping 76 matching lines @@
 
 SkImage* SkImage::NewFromTextureCopy(GrContext*, const GrBackendTextureDesc&, SkAlphaType) {
     return nullptr;
 }
 
 SkImage* SkImage::newTextureImage(GrContext*) const {
     return nullptr;
 }
 
 #endif