change colortable to use factory for reinflating, check for empty

include/core/SkColorTable.h

Index: include/core/SkColorTable.h
diff --git a/include/core/SkColorTable.h b/include/core/SkColorTable.h
index 31891e940182fb98fb0064371fe8ded6bb81c073..c6ca1e961f83f23c5f2b539d1e0279776d02ca1c 100644
--- a/include/core/SkColorTable.h
+++ b/include/core/SkColorTable.h
@@ -49,12 +49,20 @@ public:
      */
     const uint16_t* read16BitCache() const;
 
-    explicit SkColorTable(SkReadBuffer&);
     void writeToBuffer(SkWriteBuffer&) const;
 
+    // may return null
+    static SkColorTable* Create(SkReadBuffer&);
+
 private:
     static void Free16BitCache(uint16_t*);
 
+    enum AllocatedWithMalloc {
+        kAllocatedWithMalloc
+    };
+    // assumes ownership of colors (assumes it was allocated w/ malloc)
+    SkColorTable(SkPMColor* colors, int count, AllocatedWithMalloc);
+
     SkPMColor*                          fColors;
     SkLazyPtr<uint16_t, Free16BitCache> f16BitCache;
     int                                 fCount;