Added virtual destructors to VertexArrayImpl and BufferImpl

src/libGLESv2/renderer/BufferImpl.h

@@ -18,6 +18,8 @@ namespace rx
 class BufferImpl
 {
   public:
+    virtual ~BufferImpl() { }
+
     virtual void setData(const void* data, size_t size, GLenum usage) = 0;
     virtual void *getData() = 0;
     virtual void setSubData(const void* data, size_t size, size_t offset) = 0;

src/libGLESv2/renderer/VertexArrayImpl.h

@@ -19,6 +19,8 @@ namespace rx
 class VertexArrayImpl
 {
   public:
+    virtual ~VertexArrayImpl() { }
+
     virtual void setElementArrayBuffer(const gl::Buffer *buffer) = 0;
     virtual void setAttribute(size_t idx, const gl::VertexAttribute &attr) = 0;
     virtual void setAttributeDivisor(size_t idx, GLuint divisor) = 0;