Provides multiple implementations of Android's SkBitmapRegionDecoder

dm/DMSrcSink.h

Index: dm/DMSrcSink.h
diff --git a/dm/DMSrcSink.h b/dm/DMSrcSink.h
index 0aa22a06084fb795b33ee8094e2508b75bb2ca0e..b77c8b406b7ce5d11fa12c824f4fc6c915dd721f 100644
--- a/dm/DMSrcSink.h
+++ b/dm/DMSrcSink.h
@@ -12,6 +12,7 @@
 #include "SkBBHFactory.h"
 #include "SkBBoxHierarchy.h"
 #include "SkBitmap.h"
+#include "SkBitmapRegionDecoder.h"
 #include "SkCanvas.h"
 #include "SkCodec.h"
 #include "SkData.h"
@@ -100,6 +101,28 @@ private:
     skiagm::GMRegistry::Factory fFactory;
 };
 
+// Allows for testing of various implementations of Android's BitmapRegionDecoder
+class BRDSrc : public Src {
+public:
+    enum Mode {
+        kFullImage_Mode,
+        kDivisor_Mode,
+    };
+
+    BRDSrc(Path, SkBitmapRegionDecoder::Strategy, Mode, SkColorType, uint32_t);
+
+    Error draw(SkCanvas*) const override;
+    SkISize size() const override;
+    Name name() const override;
+    bool veto(SinkFlags) const override;
+private:
+    Path                            fPath;
+    SkBitmapRegionDecoder::Strategy fStrategy;
+    Mode                            fMode;
+    SkColorType                     fColorType;
+    uint32_t                        fSampleSize;
+};
+
 class CodecSrc : public Src {
 public:
     enum Mode {