Report repetition count in SkCodec

include/codec/SkCodec.h

Index: include/codec/SkCodec.h
diff --git a/include/codec/SkCodec.h b/include/codec/SkCodec.h
index c2519cb840a54dbf0f41ee54384b3b68bdc51178..f2a717c7165def1e8dbae9e76121201a1cf50654 100644
--- a/include/codec/SkCodec.h
+++ b/include/codec/SkCodec.h
@@ -607,8 +607,8 @@ public:
     /**
      *  Return info about the frames in the image.
      *
-     *  May require reading through the stream to determine the number of
-     *  frames.
+     *  May require reading through the stream to determine info about the
+     *  frames (including the count).
      *
      *  As such, future decoding calls may require a rewind.
      *
@@ -618,6 +618,21 @@ public:
         return this->onGetFrameInfo();
     }
 
+    static constexpr int kRepetitionCountInfinite = -1;
+
+    /**
+     *  Return the number of times to repeat, if this image is animated.
+     *
+     *  May require reading the stream to find the repetition count.
+     *
+     *  As such, future decoding calls may require a rewind.
+     *
+     *  For single-frame images, this will return 0.
+     */
+    int getRepetitionCount() {
+        return this->onGetRepetitionCount();
+    }
+
 protected:
     /**
      *  Takes ownership of SkStream*
@@ -766,6 +781,10 @@ protected:
         return {};
     }
 
+    virtual int onGetRepetitionCount() {
+        return 0;
+    }
+
     /**
      *  Used for testing with qcms.
      *  FIXME: Remove this when we are done comparing with qcms.