Move code to dump GrSurface as a png to helper files

src/ports/SkImagesSupport_noimages.cpp

Index: src/ports/SkImagesSupport_noimages.cpp
diff --git a/src/ports/SkImagesSupport_noimages.cpp b/src/ports/SkImagesSupport_noimages.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..edc99c14f2c82a86b2827d2aad57347419fe78ea
--- /dev/null
+++ b/src/ports/SkImagesSupport_noimages.cpp
@@ -0,0 +1,12 @@
+#include "SkImagesSupport.h"
+
+// This file should be compiled for embedders that do not compile the images sublibrary
+// as part of Skia library.
+#if SK_SUPPORT_GPU && defined(SK_DEVELOPER)
+
+bool SkSaveGrSurfacePrivPixelsAsPNG(GrSurfacePriv*, const char*) {
+    SK_CRASH();
+    return false;
+}
+
+#endif