Surface synchronization: Don't gutter translucent windows

services/ui/public/interfaces/window_manager.mojom

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 module ui.mojom;
 
 import "cc/ipc/frame_sink_id.mojom";
 import "cc/ipc/local_surface_id.mojom";
 import "services/ui/public/interfaces/cursor/cursor.mojom";
 import "services/ui/public/interfaces/event_matcher.mojom";
@@ skipping 26 matching lines @@
   //   aura property. For properties defined in PropertyConverter any change to
   //   to the aura property is mapped to the property defined here and sent to
   //   all clients that know about the window (which is generally just the owner
   //   and the window-manager).
 
   // Properties used only during creation time. --------------------------------
 
   // Whether the window should be initially focusable or not. Type: bool.
   const string kFocusable_InitProperty = "init:focusable";
 
+  // Whether the window should be opaque.
+  const string kTranslucent_InitProperty = "init:translucent";
+
   // Initial bounds to create the window at. If empty the WindowManager decides
   // the initial bounds. Type: gfx::Rect.
   const string kBounds_InitProperty = "init:bounds";
 
   // The window manager will place the window in this container when the window
   // is created. If not set a container is selected based on the window type.
   // Type: int32_t.
   const string kContainerId_InitProperty = "init:container_id";
 
   // Disables the window manager from handling immersive fullscreen for the
@@ skipping 268 matching lines @@
   OnWmCreatedTopLevelWindow(uint32 change_id, uint32 window_id);
 
   // See description in WindowManager::OnAccelerator(). |ack_id| is the value
   // that was passed to OnAccelerator(). If the accelerator is a pre-target
   // handler and |event_result| is UNHANDLED, then |properties| is added to
   // the KeyEvent that is dispatched to the client with the focused window.
   OnAcceleratorAck(uint32 ack_id,
                    EventResult event_result,
                    map<string, array<uint8>> properties);
 };