style: Rename the properties directories from "shorthand" to "shorthands", "longhand" to "longhands".

Bug: 1468651
Reviewed-by: heycam
MozReview-Commit-ID: CY4THCC4zkX

components/style/properties/longhands/padding.mako.rs

@@ -0,0 +1,29 @@
+/* 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/. */
+
+<%namespace name="helpers" file="/helpers.mako.rs" />
+<% from data import ALL_SIDES, maybe_moz_logical_alias %>
+<% data.new_style_struct("Padding", inherited=False) %>
+
+// APPLIES_TO_PLACEHOLDER so we can set it in UA  stylesheets.  But we use a
+// !important value there, so pages can't set it.
+% for side in ALL_SIDES:
+    <%
+        spec = "https://drafts.csswg.org/css-box/#propdef-padding-%s" % side[0]
+        if side[1]:
+            spec = "https://drafts.csswg.org/css-logical-props/#propdef-padding-%s" % side[1]
+    %>
+    ${helpers.predefined_type(
+        "padding-%s" % side[0],
+        "NonNegativeLengthOrPercentage",
+        "computed::NonNegativeLengthOrPercentage::zero()",
+        alias=maybe_moz_logical_alias(product, side, "-moz-padding-%s"),
+        animation_value_type="NonNegativeLengthOrPercentage",
+        logical=side[1],
+        spec=spec,
+        flags="APPLIES_TO_FIRST_LETTER APPLIES_TO_PLACEHOLDER GETCS_NEEDS_LAYOUT_FLUSH",
+        allow_quirks=not side[1],
+        servo_restyle_damage="reflow rebuild_and_reflow_inline"
+    )}
+% endfor