experimental/fiddle: update to new SkImage API

experimental/fiddle/fiddle_test

 #!/bin/sh
 # Copyright 2015 Google Inc.
 #
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 # Script for building Fiddle build bots.
 
 set -e
 set -x
 
 cd "$(dirname "$0")/../.."
 skia_dir="$PWD"
 
 if ! command -v cmake > /dev/null 2>&1 ; then
     cores=32
     echo "Bootstrapping CMake"
     cmake_dir="${skia_dir}/third_party/externals/cmake"
     cd "$cmake_dir"
     ./bootstrap --parallel=$cores
     make -j $cores cmake
     export PATH="${cmake_dir}/bin:${PATH}"
 fi
 
 echo "Building Skia and Fiddle"
 cd "${skia_dir}/experimental/fiddle"
+git clean -fxd .
 go build fiddler.go
 ./fiddler "$skia_dir"
 ./fiddler "$skia_dir" draw.cpp > /dev/null
 
 echo "cleaning up"
-cd "$skia_dir"
-git clean -fxd cmake experimental/fiddle
+git clean -fxd .