Allow creating a picture from skp to fail.

src/core/SkPicturePlayback.h

Index: src/core/SkPicturePlayback.h
diff --git a/src/core/SkPicturePlayback.h b/src/core/SkPicturePlayback.h
index 06d180fb4400ef14d1b73fcdc57347b83d46b158..144aa2f0e7f934da016aeeee1a473cc1bb10a0d0 100644
--- a/src/core/SkPicturePlayback.h
+++ b/src/core/SkPicturePlayback.h
@@ -62,7 +62,7 @@ public:
     SkPicturePlayback();
     SkPicturePlayback(const SkPicturePlayback& src, SkPictCopyInfo* deepCopyInfo = NULL);
     explicit SkPicturePlayback(const SkPictureRecord& record, bool deepCopy = false);
-    SkPicturePlayback(SkStream*, const SkPictInfo&, SkPicture::InstallPixelRefProc);
+    SkPicturePlayback(SkStream*, const SkPictInfo&, bool* isValid, SkPicture::InstallPixelRefProc);
 
     virtual ~SkPicturePlayback();
 
@@ -191,9 +191,9 @@ public:
 #endif
 
 private:    // these help us with reading/writing
-    void parseStreamTag(SkStream*, const SkPictInfo&, uint32_t tag, size_t size,
+    bool parseStreamTag(SkStream*, const SkPictInfo&, uint32_t tag, size_t size,
                         SkPicture::InstallPixelRefProc);
-    void parseBufferTag(SkOrderedReadBuffer&, uint32_t tag, size_t size);
+    bool parseBufferTag(SkOrderedReadBuffer&, uint32_t tag, size_t size);
     void flattenToBuffer(SkOrderedWriteBuffer&) const;
 
 private: