complete overhaul of webtry work partition between jail and host

experimental/webtry/scripts/fiddle_wrapper

Index: experimental/webtry/scripts/fiddle_wrapper
diff --git a/experimental/webtry/scripts/fiddle_wrapper b/experimental/webtry/scripts/fiddle_wrapper
new file mode 100755
index 0000000000000000000000000000000000000000..cd3e75023d68c1159749c71b5a6c2e18c9b1b529
--- /dev/null
+++ b/experimental/webtry/scripts/fiddle_wrapper
@@ -0,0 +1,18 @@
+#!/bin/bash
+
+# run_fiddle takes the hash of the fiddle as its only argument, and then:
+#
+# 1) runs fiddle_gyp to create the gyp file
+# 2) runs ninja to build the executable
+# 3) runs the resulting executable to generate the output .png file.
+#
+# the output PNG file goes into the inout directory, which is shared between the chroot
+# jail and the webserver environment.
+
+[ -z "$SKIA_ROOT" ] && SKIA_ROOT="/skia_build/skia"
+
+cd $SKIA_ROOT/experimental/webtry/scripts
+
+./fiddle_gyp $1
+./fiddle_ninja $1
+./fiddle_run $1