import FIREFOX_52_6_0esr_RELEASE from mozilla-esr52 hg repo

toolkit/themes/osx/global/tree/arrow-disclosure.svg

@@ -0,0 +1,28 @@
+<!-- This Source Code Form is subject to the terms of the Mozilla Public
+   - License, v. 2.0. If a copy of the MPL was not distributed with this
+   - file, You can obtain one at http://mozilla.org/MPL/2.0/. -->
+<svg width="16" height="16" viewBox="0 0 16 16" xmlns="http://www.w3.org/2000/svg">
+
+  <style>
+    .icon:not(:target) {
+      display: none;
+    }
+
+    .icon {
+      fill: #8c8c8c;
+    }
+
+    .icon.white {
+      fill: #fff;
+    }
+  </style>
+
+  <polygon id="arrow-disclosure-collapsed" class="icon" points="4,4  12,8.5  4,13" />
+  <polygon id="arrow-disclosure-collapsed-rtl" class="icon" points="4,8.5  12,4  12,13" />
+  <polygon id="arrow-disclosure-collapsed-inverted" class="icon white" points="4,4  12,8.5  4,13" />
+  <polygon id="arrow-disclosure-collapsed-inverted-rtl" class="icon white" points="4,8.5  12,4  12,13" />
+
+  <polygon id="arrow-disclosure-expanded" class="icon" points="3,5  12,5  7.5,13" />
+  <polygon id="arrow-disclosure-expanded-inverted" class="icon white" points="3,5  12,5  7.5,13" />
+
+</svg>