mus: Allow the WM to specify the windows that can have active children.

mandoline/ui/desktop_ui/browser_window.cc

 // 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.
 
 #include "mandoline/ui/desktop_ui/browser_window.h"
 
 #include "base/command_line.h"
 #include "base/strings/string16.h"
 #include "base/strings/utf_string_conversions.h"
 #include "base/time/time.h"
@@ skipping 184 matching lines @@
   root_ = root;
 
   host_->SetTitle("Mandoline");
 
   content_ = root_->connection()->NewWindow();
   Init(root_);
 
   host_->SetSize(mojo::Size::From(gfx::Size(1280, 800)));
 
   root_->AddChild(content_);
+  host_->SetActivationParent(root_->id(), true);
   content_->SetVisible(true);
 
   web_view_.Init(app_, content_);
 
   host_->AddAccelerator(
       static_cast<uint32_t>(BrowserCommand::CLOSE),
       mus::CreateKeyMatcher(mus::mojom::KEYBOARD_CODE_W,
                             mus::mojom::EVENT_FLAGS_CONTROL_DOWN));
   host_->AddAccelerator(
       static_cast<uint32_t>(BrowserCommand::FOCUS_OMNIBOX),
@@ skipping 230 matching lines @@
   content_bounds.set_width(DIPSToPixels(progress_bar_bounds.width()));
   content_bounds.set_height(host->bounds().height() - content_bounds.y() -
                             DIPSToPixels(10));
   content_->SetBounds(content_bounds);
 
   // The omnibox view bounds are in physical pixels.
   omnibox_view_->SetBounds(bounds_in_physical_pixels);
 }
 
 }  // namespace mandoline