Preserve texture compression when saving a revised skp from debugger

Without this CL, saving a revised skp out the debugger can greatly expand the memory it requires.

Review URL: https://codereview.chromium.org/1020103005
diff --git a/gm/displacement.cpp b/gm/displacement.cpp
index bcf759a..91405d6 100644
--- a/gm/displacement.cpp
+++ b/gm/displacement.cpp
@@ -5,10 +5,10 @@
  * found in the LICENSE file.
  */
 
-#include "sk_tool_utils.h"
 #include "SkBitmapSource.h"
 #include "SkDisplacementMapEffect.h"
 #include "gm.h"
+#include "sk_tool_utils.h"
 
 namespace skiagm {