Add files from google3 to Git repo.

tools/get_skia_lkgr.sh

Index: tools/get_skia_lkgr.sh
diff --git a/tools/get_skia_lkgr.sh b/tools/get_skia_lkgr.sh
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+#!/bin/bash
+# Copyright 2014 Google Inc.
+#
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+# Outputs the Last Known Good Revision of Skia.
+
+source gbash.sh || exit
+
+set -x -e
+
+# Retrieve last known good revision. (App-engine script is very flaky, so retry
+# 10 times.)
+LKGR=""
+for i in `seq 1 10`; do
+  LKGR=$(curl "http://skia-tree-status-staging.appspot.com/lkgr")
+  if [[ ${#LKGR} -gt 4 ]]; then
+    break
+  fi
+done
+[[ ${#LKGR} -gt 4 ]] || gbash::die "Unable to get Skia LKGR (got '${LKGR}')"
+echo "${LKGR}"