Mash: propagate kAnimationsDisabled window property

Some windows, including tab-dragging window, want to suppress
the window animations. This property needs to be propagated
to Ash to take an effect.

BUG=867074
TEST=manually

Change-Id: I80847702e26cd04981cac71b02114389312d83e1
Reviewed-on: https://chromium-review.googlesource.com/1166331Reviewed-by: Jun Mukai <mukai@chromium.org>
Reviewed-by: Scott Violet <sky@chromium.org>
Reviewed-by: Tom Sepez <tsepez@chromium.org>
Commit-Queue: Jun Mukai <mukai@chromium.org>
Cr-Commit-Position: refs/heads/master@{#581896}

services/ui/public/interfaces/window_manager.mojom

@@ -68,6 +68,9 @@ interface WindowManager {
   // Type: bool.
   const string kAlwaysOnTop_Property = "prop:always_on_top";
 
+  // A boolean determining whether animations are disabled for the window.
+  const string kAnimationsDisabled_Property = "prop:animations-disabled";
+
   // The application icon; typically larger for shelf icons, etc. Type: SkBitmap
   const string kAppIcon_Property = "prop:app-icon";
 

ui/aura/mus/property_converter.cc

@@ -105,6 +105,10 @@ PropertyConverter::PropertyConverter() {
       client::kWindowCornerRadiusKey,
       ui::mojom::WindowManager::kWindowCornerRadius_Property,
       base::BindRepeating(&ValidateWindowCornerRadius));
+  RegisterPrimitiveProperty(
+      client::kAnimationsDisabledKey,
+      ui::mojom::WindowManager::kAnimationsDisabled_Property,
+      CreateAcceptAnyValueCallback());
 }
 
 PropertyConverter::~PropertyConverter() {}