Invalidate GrTexture mipmap on content change notification

src/core/SkPixelRef.cpp

 /*
  * Copyright 2011 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkBitmapCache.h"
 #include "SkPixelRef.h"
 #include "SkThread.h"
@@ skipping 317 matching lines @@
 }
 
 void SkPixelRef::notifyPixelsChanged() {
 #ifdef SK_DEBUG
     if (fIsImmutable) {
         SkDebugf("========== notifyPixelsChanged called on immutable pixelref");
     }
 #endif
     this->callGenIDChangeListeners();
     this->needsNewGenID();
+    this->onNotifyPixelsChanged();
 }
 
 void SkPixelRef::changeAlphaType(SkAlphaType at) {
     *const_cast<SkImageInfo*>(&fInfo) = fInfo.makeAlphaType(at);
 }
 
 void SkPixelRef::setImmutable() {
     fIsImmutable = true;
 }
 
 bool SkPixelRef::readPixels(SkBitmap* dst, const SkIRect* subset) {
     return this->onReadPixels(dst, subset);
 }
 
 ///////////////////////////////////////////////////////////////////////////////////////////////////
 
 bool SkPixelRef::onReadPixels(SkBitmap* dst, const SkIRect* subset) {
     return false;
 }
 
+void SkPixelRef::onNotifyPixelsChanged() { }
+
 SkData* SkPixelRef::onRefEncodedData() {
     return NULL;
 }
 
 bool SkPixelRef::onGetYUV8Planes(SkISize sizes[3], void* planes[3], size_t rowBytes[3],
                                  SkYUVColorSpace* colorSpace) {
     return false;
 }
 
 size_t SkPixelRef::getAllocatedSizeInBytes() const {
@@ skipping 12 matching lines @@
     }
 
     result->fUnlockProc = unlock_legacy_result;
     result->fUnlockContext = SkRef(this);   // this is balanced in our fUnlockProc
     result->fCTable = fRec.fColorTable;
     result->fPixels = fRec.fPixels;
     result->fRowBytes = fRec.fRowBytes;
     result->fSize.set(fInfo.width(), fInfo.height());
     return true;
 }