Add support for multiple frames in SkCodec

src/codec/SkCodecAnimation.h

Index: src/codec/SkCodecAnimation.h
diff --git a/src/codec/SkCodecAnimation.h b/src/codec/SkCodecAnimation.h
index 2ce5178c6a8e4025d6539c539edf07cc9dfc5c87..0cd9f9e24a870dff5377e9f571fb9cd9e62a9adb 100644
--- a/src/codec/SkCodecAnimation.h
+++ b/src/codec/SkCodecAnimation.h
@@ -8,6 +8,7 @@
 #ifndef SkCodecAnimation_DEFINED
 #define SkCodecAnimation_DEFINED
 
+#include "SkCodec.h"
 #include "SkRect.h"
 
 class SkCodecAnimation {
@@ -43,18 +44,11 @@ public:
         RestorePrevious_DisposalMethod  = 3,
     };
 
-    struct FrameInfo {
+    struct FrameInfo : public SkCodec::FrameInfo {
         DisposalMethod fDisposalMethod;
 
-        // The frame that this frame is drawn on top of, or
-        // SkCodec::kIndependentFrame.
-        size_t fRequiredFrame;
-
         // The subset of the bounds that this frame describes.
         SkIRect fFrameRect;
-
-        // How many 1/100 seconds to show this frame.
-        size_t fDuration;
     };
 private:
     SkCodecAnimation();