Give GrGLProgramStage a virtual destructor

Review URL: http://codereview.appspot.com/6127044



git-svn-id: http://skia.googlecode.com/svn/trunk@3767 2bbb7eff-a529-9590-31e7-b0007b416f81

src/gpu/gl/GrGLProgramStage.cpp

@@ -8,6 +8,11 @@
 #include "GrGLSL.h"
 #include "GrGLProgramStage.h"
 
+GrGLProgramStage::~GrGLProgramStage() {
+}
+
+///////////////////////////////////////////////////////////////////////////////
+
 GrGLProgramStageFactory::~GrGLProgramStageFactory(void) {
 
 }

src/gpu/gl/GrGLProgramStage.h

@@ -36,7 +36,8 @@ public:
     };
 
     typedef GrTAllocator<GrGLShaderVar> VarArray;
-
+    
+    virtual ~GrGLProgramStage();
 
     /** Creates any uniform variables the vertex shader requires
         and appends them to vsUnis;