remove unused helper function

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 "GrTextureMaker.h"
 
 #include "SkGr.h"
@@ skipping 502 matching lines @@
         make_stretched_key(key, stretch, &stretchedKey);
         return ctx->textureProvider()->existsTextureWithUniqueKey(stretchedKey);
     }
 
     GrUniqueKey key, stretchedKey;
     make_image_keys(imageID, subset, stretch, &key, &stretchedKey);
     return ctx->textureProvider()->existsTextureWithUniqueKey(
         (SkGrStretch::kNone_Type == stretch.fType) ? key : stretchedKey);
 }
 
-bool GrIsBitmapInCache(const GrContext* ctx, const SkBitmap& bitmap,
-                       const GrTextureParams* params) {
-    if (bitmap.isVolatile()) {
-        return false;   // we don't cache volatile bitmaps.
-    }
-    return GrIsImageInCache(ctx, bitmap.getGenerationID(), bitmap.getSubset(), bitmap.getTexture(),
-                            params);
-}
-
 class Bitmap_GrTextureMaker : public GrTextureMaker {
 public:
     Bitmap_GrTextureMaker(const SkBitmap& bitmap)
         : INHERITED(bitmap.width(), bitmap.height())
         , fBitmap(bitmap)
     {}
 
 protected:
     GrTexture* onRefUnstretchedTexture(GrContext* ctx) override {
         GrTexture* tex = fBitmap.getTexture();
@@ skipping 416 matching lines @@
         SkBitmap stretchedBmp = stretch_on_cpu(bitmap, stretch);
         return create_unstretched_bitmap_texture(ctx, stretchedBmp, GrUniqueKey());
     } else {
         SkAutoTUnref<GrTexture> unstretched(this->onRefUnstretchedTexture(ctx));
         if (!unstretched) {
             return nullptr;
         }
         return stretch_texture(unstretched, stretch, nullptr, GrUniqueKey());
     }
 }