Add recreate_skps script

BUG=skia:3008

Review URL: https://codereview.chromium.org/655313003
diff --git a/.gitignore b/.gitignore
index b8d31f3..4b2564c 100644
--- a/.gitignore
+++ b/.gitignore
@@ -18,4 +18,6 @@
 platform_tools/chromeos/toolchain
 third_party/externals
 tools/bug_chomper/oauth_client_secret.json
+tools/skp/page_sets/data/*.json
+tools/skp/page_sets/data/*.wpr
 xcodebuild