move SkBitmapProvider to its own file

src/core/SkBitmapController.h

 /*
  * Copyright 2015 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef SkBitmapController_DEFINED
 #define SkBitmapController_DEFINED
 
 #include "SkBitmap.h"
 #include "SkBitmapCache.h"
 #include "SkFilterQuality.h"
-#include "SkImage.h"
 #include "SkMatrix.h"
 
-class SkBitmapProvider {
-public:
-    explicit SkBitmapProvider(const SkBitmap& bm) : fBitmap(bm) {}
-    explicit SkBitmapProvider(const SkImage* img) : fImage(SkSafeRef(img)) {}
-    SkBitmapProvider(const SkBitmapProvider& other)
-        : fBitmap(other.fBitmap)
-        , fImage(SkSafeRef(other.fImage.get()))
-    {}
-
-    int width() const;
-    int height() const;
-    uint32_t getID() const;
-
-    bool validForDrawing() const;
-    SkImageInfo info() const;
-
-    SkBitmapCacheDesc makeCacheDesc(int w, int h) const;
-    SkBitmapCacheDesc makeCacheDesc() const;
-    void notifyAddedToCache() const;
-
-    // Only call this if you're sure you need the bits, since it make be expensive
-    // ... cause a decode and cache, or gpu-readback
-    bool asBitmap(SkBitmap*) const;
-
-private:
-    SkBitmap fBitmap;
-    SkAutoTUnref<const SkImage> fImage;
-};
+class SkBitmapProvider;
 
 /**
  *  Handles request to scale, filter, and lock a bitmap to be rasterized.
  */
 class SkBitmapController : ::SkNoncopyable {
 public:
     class State : ::SkNoncopyable {
     public:
         virtual ~State() {}
 
@@ skipping 29 matching lines @@
 class SkDefaultBitmapController : public SkBitmapController {
 public:
     SkDefaultBitmapController() {}
     
 protected:
     State* onRequestBitmap(const SkBitmapProvider&, const SkMatrix& inverse, SkFilterQuality,
                            void* storage, size_t storageSize) override;
 };
 
 #endif