Add onMemoryDump to GrContext

src/gpu/gl/GrGLStencilAttachment.h

Index: src/gpu/gl/GrGLStencilAttachment.h
diff --git a/src/gpu/gl/GrGLStencilAttachment.h b/src/gpu/gl/GrGLStencilAttachment.h
index fd1214e576e5596ecb6cb747b5674b8f91b72b6b..3b89a5aa21123e1a16af4e3b3d93ac89b1aee66b 100644
--- a/src/gpu/gl/GrGLStencilAttachment.h
+++ b/src/gpu/gl/GrGLStencilAttachment.h
@@ -50,6 +50,8 @@ protected:
     // overrides of GrResource
     void onRelease() override;
     void onAbandon() override;
+    void setMemoryBacking(SkTraceMemoryDump* traceMemoryDump,
+                          const SkString& dumpName) const override;
 
 private:
     size_t onGpuMemorySize() const override;