Fixed a few places where uninitialized memory could have been read

include/core/SkFlattenableBuffers.h

 
 /*
  * Copyright 2012 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef SkFlattenableBuffers_DEFINED
 #define SkFlattenableBuffers_DEFINED
@@ skipping 136 matching lines @@
     /** This function validates that the isValid input parameter is true
       * If isValidating() is false, then true is always returned
       * If isValidating() is true, then true is returned until validate() is called with isValid
       * set to false. When isValid is false, an error flag will be set internally and, from that
       * point on, validate() will return false. The error flag cannot be unset.
       *
       * @param isValid result of a test that is expected to be true
       */
     virtual bool validate(bool isValid);
 
+    /** This function returns true by default
+      * If isValidating() is true, it will return false if the internal error flag is set.
+      * Otherwise, it will return true.
+      */
+    virtual bool isValid() const { return true; }
+
 private:
     template <typename T> T* readFlattenableT();
     uint32_t fFlags;
 };
 
 ///////////////////////////////////////////////////////////////////////////////
 
 class SkFlattenableWriteBuffer {
 public:
     SkFlattenableWriteBuffer();
@@ skipping 65 matching lines @@
     }
 
 protected:
     // A helper function so that each subclass does not have to be a friend of SkFlattenable
     void flattenObject(const SkFlattenable* obj, SkFlattenableWriteBuffer& buffer);
 
     uint32_t fFlags;
 };
 
 #endif