Add new skpinfo tool

include/core/SkPicture.h

Index: include/core/SkPicture.h
===================================================================
--- include/core/SkPicture.h	(revision 13626)
+++ include/core/SkPicture.h	(working copy)
@@ -217,6 +217,16 @@
     void abortPlayback();
 #endif
 
+    // Return true if the SkStream/Buffer represents a serialized picture, and
+    // fills out SkPictInfo. After this function returns, the data source is not
+    // rewound so it will have to be manually reset before passing to 
+    // CreateFromStream or CreateFromBuffer. Note, CreateFromStream and
+    // CreateFromBuffer perform this check internally so these entry points are
+    // intended for stand alone tools.
+    // If false is returned, SkPictInfo is unmodified.

[reed1, 2014/03/03 16:24:28]

Do we expect to support these for chrome or other clients? If not (and I know of
no reason yet), perhaps we can make their names scary?
InternalOnly_StreamIsSKP(...) ? Just being scared.

[robertphillips, 2014/03/03 18:44:24]

Done.

+    static bool StreamIsSKP(SkStream*, SkPictInfo*);
+    static bool BufferIsSKP(SkReadBuffer&, SkPictInfo*);
+
 protected:
     // V2 : adds SkPixelRef's generation ID.
     // V3 : PictInfo tag at beginning, and EOF tag at the end
@@ -262,13 +272,6 @@
     // For testing. Derived classes may instantiate an alternate
     // SkBBoxHierarchy implementation
     virtual SkBBoxHierarchy* createBBoxHierarchy() const;
-
-    // Return true if the SkStream represents a serialized picture, and fills out
-    // SkPictInfo. After this function returns, the SkStream is not rewound; it
-    // will be ready to be parsed to create an SkPicturePlayback.
-    // If false is returned, SkPictInfo is unmodified.
-    static bool StreamIsSKP(SkStream*, SkPictInfo*);
-    static bool BufferIsSKP(SkReadBuffer&, SkPictInfo*);
 private:
     void createHeader(void* header) const;