Fix iOS surface creation for SampleApp

include/views/SkWindow.h

Index: include/views/SkWindow.h
diff --git a/include/views/SkWindow.h b/include/views/SkWindow.h
index e964fc681b5a65e6e1b7b2ef9f6b5c1a909d865d..1c4b5aef89ee75ec18fc1c02e3f15598edecb483 100644
--- a/include/views/SkWindow.h
+++ b/include/views/SkWindow.h
@@ -80,6 +80,11 @@ public:
 
     virtual sk_sp<SkSurface> makeSurface();
 
+#if SK_SUPPORT_GPU
+    sk_sp<SkSurface> makeGpuBackedSurface(const AttachmentInfo& attachmentInfo,
+                                          const GrGLInterface* , GrContext* grContext);
+#endif
+
 protected:
     virtual bool onEvent(const SkEvent&);
     virtual bool onDispatchClick(int x, int y, Click::State, void* owner, unsigned modi);
@@ -97,11 +102,6 @@ protected:
     virtual bool onGetFocusView(SkView** focus) const;
     virtual bool onSetFocusView(SkView* focus);
 
-#if SK_SUPPORT_GPU
-    sk_sp<SkSurface> makeGpuBackedSurface(const AttachmentInfo& attachmentInfo,
-                                          const GrGLInterface* , GrContext* grContext);
-#endif
-
 private:
     SkSurfaceProps  fSurfaceProps;
     SkBitmap    fBitmap;