header cleanup

Change-Id: I3f7667a1357194ae2bdd341ad9d46eb93920f404
Reviewed-on: https://skia-review.googlesource.com/21374
Reviewed-by: Brian Salomon <bsalomon@google.com>
Commit-Queue: Hal Canary <halcanary@google.com>
diff --git a/src/codec/SkFrameHolder.h b/src/codec/SkFrameHolder.h
index 0f30b65..29539ff 100644
--- a/src/codec/SkFrameHolder.h
+++ b/src/codec/SkFrameHolder.h
@@ -11,6 +11,7 @@
 #include "SkTypes.h"
 #include "SkCodecAnimation.h"
 #include "SkCodecAnimationPriv.h"
+#include "SkRect.h"
 
 /**
  *  Base class for a single frame of an animated image.