style: Part 6: Add individual transform properties into compositor an…

…imation list.

Now, its time to let individual transform run on the compositor thread.

Differential Revision: https://phabricator.services.mozilla.com/D22566

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

@@ -365,7 +365,7 @@ ${helpers.predefined_type(
     "generics::transform::Rotate::None",
     animation_value_type="ComputedValue",
     boxed=True,
-    flags="CREATES_STACKING_CONTEXT FIXPOS_CB",
+    flags="CREATES_STACKING_CONTEXT FIXPOS_CB CAN_ANIMATE_ON_COMPOSITOR",
     gecko_pref="layout.css.individual-transform.enabled",
     spec="https://drafts.csswg.org/css-transforms-2/#individual-transforms",
     servo_restyle_damage = "reflow_out_of_flow",
@@ -377,7 +377,7 @@ ${helpers.predefined_type(
     "generics::transform::Scale::None",
     animation_value_type="ComputedValue",
     boxed=True,
-    flags="CREATES_STACKING_CONTEXT FIXPOS_CB",
+    flags="CREATES_STACKING_CONTEXT FIXPOS_CB CAN_ANIMATE_ON_COMPOSITOR",
     gecko_pref="layout.css.individual-transform.enabled",
     spec="https://drafts.csswg.org/css-transforms-2/#individual-transforms",
     servo_restyle_damage = "reflow_out_of_flow",
@@ -389,7 +389,7 @@ ${helpers.predefined_type(
     "generics::transform::Translate::None",
     animation_value_type="ComputedValue",
     boxed=True,
-    flags="CREATES_STACKING_CONTEXT FIXPOS_CB",
+    flags="CREATES_STACKING_CONTEXT FIXPOS_CB CAN_ANIMATE_ON_COMPOSITOR",
     gecko_pref="layout.css.individual-transform.enabled",
     spec="https://drafts.csswg.org/css-transforms-2/#individual-transforms",
     servo_restyle_damage="reflow_out_of_flow",