docs/fiddle: add "incomplete" fiddle.

Change-Id: I66246d6c421cf91b459207d91e4899c4c030e45e
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/248159
Reviewed-by: Ben Wagner aka dogben <benjaminwagner@google.com>
Commit-Queue: Hal Canary <halcanary@google.com>

docs/examples/incomplete.cpp

@@ -0,0 +1,9 @@
+// Copyright 2019 Google LLC.
+// Use of this source code is governed by a BSD-style license that can be found in the LICENSE file.
+#include "tools/fiddle/examples.h"
+// HASH=882e8e0103048009a25cfc20400492f7
+REG_FIDDLE(incomplete, 256, 256, false, 0) {
+void draw(SkCanvas* canvas) {
+    // incomplete
+}
+}  // END FIDDLE

tools/fiddle/all_examples.cpp

@@ -1071,3 +1071,4 @@
 #include "../../docs/examples/Text_Skew_X.cpp"
 #include "../../docs/examples/Typeface_Methods.cpp"
 #include "../../docs/examples/Xor.cpp"
+#include "../../docs/examples/incomplete.cpp"