Checking structure sizes before reading them from memory to avoid overflowing the buffer's stream.

include/core/SkRegion.h

Index: include/core/SkRegion.h
diff --git a/include/core/SkRegion.h b/include/core/SkRegion.h
index a088d546200be5211aff976fddc2118a1b392af1..c3aa327a00af34c78948bd9dac6a29ff6c297049 100644
--- a/include/core/SkRegion.h
+++ b/include/core/SkRegion.h
@@ -12,6 +12,7 @@
 
 #include "SkRect.h"
 
+class SkFlattenableReadBuffer;
 class SkPath;
 class SkRgnBuilder;
 
@@ -358,6 +359,14 @@ public:
     };
 
     /**
+     *  Returns the number of bytes of the current object's flattened representation.
+     */
+    uint32_t sizeInMemory() const;
+    /**
+     *  Returns the number of bytes to read.
+     */
+    static uint32_t SizeToRead(SkFlattenableReadBuffer& buffer);
+    /**
      *  Write the region to the buffer, and return the number of bytes written.
      *  If buffer is NULL, it still returns the number of bytes.
      */