Add SKP_VERSION file to determine which SKPs to download

BUG=skia:2225
R=epoger@google.com, rmistry@google.com, bensong@google.com

Author: borenet@google.com

Review URL: https://codereview.chromium.org/299403009

git-svn-id: http://skia.googlecode.com/svn/trunk@14913 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/SKP_VERSION b/SKP_VERSION
new file mode 100644
index 0000000..d00491f
--- /dev/null
+++ b/SKP_VERSION
@@ -0,0 +1 @@
+1