Add extra warnings to match what Android uses.

src/animator/SkScriptCallBack.h

 
 /*
  * Copyright 2011 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 #ifndef SkScriptCallBack_DEFINED
 #define SkScriptCallBack_DEFINED
 
 #include "SkOperand2.h"
 #include "SkTDArray_Experimental.h"
 
 class SkScriptCallBack {
 public:
+    virtual ~SkScriptCallBack() { }
+
     enum Type {
         kBox,
         kFunction,
         kMember,
         kMemberFunction,
         kProperty,
         kUnbox
     };
 
     virtual bool getReference(const char* , size_t len, SkScriptValue2* result) {  return false; }
@@ skipping 30 matching lines @@
 };
 
 class SkScriptCallBackProperty : public SkScriptCallBack {
 public:
     virtual bool getConstValue(const char* name, size_t len, SkOperand2* value) { return false; }
     virtual bool getResult(size_t ref, SkOperand2* answer) { return false; }
     virtual Type getType() const { return kProperty; }
 };
 
 #endif // SkScriptCallBack_DEFINED