Split GrResource into GrCacheable/GrGpuObject

src/gpu/gl/GrGLVertexBuffer.h

Index: src/gpu/gl/GrGLVertexBuffer.h
diff --git a/src/gpu/gl/GrGLVertexBuffer.h b/src/gpu/gl/GrGLVertexBuffer.h
index 1741adc23d8c92c620be80fbf0bba9ccd4da063f..1b9c4f17beb740e47529920a361331e00aa9019d 100644
--- a/src/gpu/gl/GrGLVertexBuffer.h
+++ b/src/gpu/gl/GrGLVertexBuffer.h
@@ -26,7 +26,7 @@ public:
     size_t baseOffset() const { return fImpl.baseOffset(); }
 
     void bind() const {
-        if (this->isValid()) {
+        if (!this->wasDestroyed()) {
             fImpl.bind(this->getGpuGL());
         }
     }
@@ -45,7 +45,7 @@ protected:
 
 private:
     GrGpuGL* getGpuGL() const {
-        SkASSERT(this->isValid());
+        SkASSERT(!this->wasDestroyed());
         return (GrGpuGL*)(this->getGpu());
     }