implement isABitmap for imageshader, return localmatrix for bitmap's impl

src/image/SkImage_Base.h

 /*
  * Copyright 2012 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef SkImage_Base_DEFINED
 #define SkImage_Base_DEFINED
 
@@ skipping 15 matching lines @@
     SkImage_Base(int width, int height, uint32_t uniqueID);
     virtual ~SkImage_Base();
 
     // User: returns image info for this SkImage.
     // Implementors: if you can not return the value, return an invalid ImageInfo with w=0 & h=0
     // & unknown color space.
     virtual SkImageInfo onImageInfo() const = 0;
 
     virtual bool onPeekPixels(SkPixmap*) const { return false; }
 
+    virtual const SkBitmap* onPeekBitmap() const { return nullptr; }
+
     // Default impl calls onDraw
     virtual bool onReadPixels(const SkImageInfo& dstInfo, void* dstPixels, size_t dstRowBytes,
                               int srcX, int srcY, CachingHint) const;
 
     virtual GrTexture* peekTexture() const { return nullptr; }
     virtual SkImageCacherator* peekCacherator() const { return nullptr; }
 
     // return a read-only copy of the pixels. We promise to not modify them,
     // but only inspect them (or encode them).
     virtual bool getROPixels(SkBitmap*, CachingHint = kAllow_CachingHint) const = 0;
@@ skipping 34 matching lines @@
 
 static inline SkImage_Base* as_IB(const sk_sp<SkImage>& image) {
     return static_cast<SkImage_Base*>(image.get());
 }
 
 static inline const SkImage_Base* as_IB(const SkImage* image) {
     return static_cast<const SkImage_Base*>(image);
 }
 
 #endif