Add override

src/gpu/SkGr.cpp

 /*
  * Copyright 2010 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 
 #include "SkGr.h"
 
@@ skipping 273 matching lines @@
     {
         if (!bitmap.isVolatile()) {
             SkIPoint origin = bitmap.pixelRefOrigin();
             SkIRect subset = SkIRect::MakeXYWH(origin.fX, origin.fY, bitmap.width(),
                                                bitmap.height());
             GrMakeKeyFromImageID(&fOriginalKey, bitmap.pixelRef()->getGenerationID(), subset);
         }
     }
 
 protected:
-    GrTexture* refOriginalTexture(GrContext* ctx) {
+    GrTexture* refOriginalTexture(GrContext* ctx) override {
         GrTexture* tex = fBitmap.getTexture();
         if (tex) {
             return SkRef(tex);
         }
 
         if (fOriginalKey.isValid()) {
             tex = ctx->textureProvider()->findAndRefTextureByUniqueKey(fOriginalKey);
             if (tex) {
                 return tex;
             }
@@ skipping 361 matching lines @@
             SkErrorInternals::SetError( kInvalidPaint_SkError,
                                         "Sorry, I don't understand the filtering "
                                         "mode you asked for.  Falling back to "
                                         "MIPMaps.");
             textureFilterMode = GrTextureParams::kMipMap_FilterMode;
             break;
 
     }
     return textureFilterMode;
 }