[infra] Add ios-dev-image-11.4 asset

Needed for https://skia-review.googlesource.com/c/skia/+/270446

Bug: skia:9799
Change-Id: I0b5814aa3bae73ca6c231b5ced7a0c94e0efa6dc
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/270447
Commit-Queue: Ben Wagner aka dogben <benjaminwagner@google.com>
Reviewed-by: Weston Tracey <westont@google.com>
diff --git a/infra/bots/assets/ios-dev-image-11.4/README.md b/infra/bots/assets/ios-dev-image-11.4/README.md
new file mode 100644
index 0000000..5cea787
--- /dev/null
+++ b/infra/bots/assets/ios-dev-image-11.4/README.md
@@ -0,0 +1,7 @@
+To create or update this asset, you will need a Mac with Xcode installed. Just
+run
+
+```shell
+./upload.py --target_dir \
+  /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/DeviceSup‌​port/11.4
+```
diff --git a/infra/bots/assets/ios-dev-image-11.4/VERSION b/infra/bots/assets/ios-dev-image-11.4/VERSION
new file mode 100644
index 0000000..56a6051
--- /dev/null
+++ b/infra/bots/assets/ios-dev-image-11.4/VERSION
@@ -0,0 +1 @@
+1
\ No newline at end of file
diff --git a/infra/bots/assets/ios-dev-image-11.4/common.py b/infra/bots/assets/ios-dev-image-11.4/common.py
new file mode 100755
index 0000000..caa0ad8
--- /dev/null
+++ b/infra/bots/assets/ios-dev-image-11.4/common.py
@@ -0,0 +1,26 @@
+#!/usr/bin/env python
+#
+# Copyright 2017 Google Inc.
+#
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+
+"""Common vars used by scripts in this directory."""
+
+
+import os
+import sys
+
+FILE_DIR = os.path.dirname(os.path.abspath(__file__))
+INFRA_BOTS_DIR = os.path.realpath(os.path.join(FILE_DIR, os.pardir, os.pardir))
+
+sys.path.insert(0, INFRA_BOTS_DIR)
+from assets import assets
+
+ASSET_NAME = os.path.basename(FILE_DIR)
+
+
+def run(cmd):
+  """Run a command, eg. "upload" or "download". """
+  assets.main([cmd, ASSET_NAME] + sys.argv[1:])
diff --git a/infra/bots/assets/ios-dev-image-11.4/download.py b/infra/bots/assets/ios-dev-image-11.4/download.py
new file mode 100755
index 0000000..ca999e0
--- /dev/null
+++ b/infra/bots/assets/ios-dev-image-11.4/download.py
@@ -0,0 +1,16 @@
+#!/usr/bin/env python
+#
+# Copyright 2017 Google Inc.
+#
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+
+"""Download the current version of the asset."""
+
+
+import common
+
+
+if __name__ == '__main__':
+  common.run('download')
diff --git a/infra/bots/assets/ios-dev-image-11.4/upload.py b/infra/bots/assets/ios-dev-image-11.4/upload.py
new file mode 100755
index 0000000..bdfbda7
--- /dev/null
+++ b/infra/bots/assets/ios-dev-image-11.4/upload.py
@@ -0,0 +1,16 @@
+#!/usr/bin/env python
+#
+# Copyright 2017 Google Inc.
+#
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+
+"""Upload a new version of the asset."""
+
+
+import common
+
+
+if __name__ == '__main__':
+  common.run('upload')