Surface synchronization: Don't gutter translucent windows

ui/views/mus/mus_client.cc

 // Copyright 2016 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.
 
 #include "ui/views/mus/mus_client.h"
 
 #include "base/bind.h"
 #include "base/memory/ptr_util.h"
 #include "base/message_loop/message_loop.h"
 #include "base/single_thread_task_runner.h"
@@ skipping 153 matching lines @@
 
   std::map<std::string, TransportType> properties = init_params.mus_properties;
 
   // Widget::InitParams::Type matches ui::mojom::WindowType.
   properties[WindowManager::kWindowType_InitProperty] =
       mojo::ConvertTo<TransportType>(static_cast<int32_t>(init_params.type));
 
   properties[WindowManager::kFocusable_InitProperty] =
       mojo::ConvertTo<TransportType>(init_params.CanActivate());
 
+  properties[WindowManager::kTranslucent_InitProperty] =
+      mojo::ConvertTo<TransportType>(init_params.opacity ==
+                                     Widget::InitParams::TRANSLUCENT_WINDOW);
+
   if (!init_params.bounds.IsEmpty()) {
     properties[WindowManager::kBounds_InitProperty] =
         mojo::ConvertTo<TransportType>(init_params.bounds);
   }
 
   if (!init_params.name.empty()) {
     properties[WindowManager::kName_Property] =
         mojo::ConvertTo<TransportType>(init_params.name);
   }
 
@@ skipping 135 matching lines @@
     // TODO: this likely gets z-order wrong. http://crbug.com/663606.
     gfx::Point relative_point(point);
     window_tree_host->ConvertScreenInPixelsToDIP(&relative_point);
     if (gfx::Rect(root->bounds().size()).Contains(relative_point))
       return root->GetEventHandlerForPoint(relative_point);
   }
   return nullptr;
 }
 
 }  // namespace views