Primary display change notifications.

services/ui/ws/window_manager_state.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 "services/ui/ws/window_manager_state.h"
 
 #include <utility>
 
 #include "base/memory/weak_ptr.h"
 #include "services/service_manager/public/interfaces/connector.mojom.h"
@@ skipping 418 matching lines @@
     post_target_accelerator_ = accelerator;
 
   // Ignore |tree| because it will receive the event via normal dispatch.
   window_server()->SendToPointerWatchers(event, user_id(), target, tree);
 
   tree->DispatchInputEvent(target, event);
 }
 
 void WindowManagerState::AddDebugAccelerators() {
   const DebugAccelerator accelerator = {
-      DebugAcceleratorType::PRINT_WINDOWS, ui::VKEY_S,
+      DebugAcceleratorType::PRINT_WINDOWS, ui::VKEY_B,

[sky, 2016/10/28 17:08:47]

Is there a reason you're changing this?

[kylechar, 2016/10/28 19:40:37]

There is an existing ash shortcut that's mapped to Ctrl+Shift+Alt+S. I'm not
sure which is better to change?

[sky, 2016/10/28 19:59:36]

I tend to think we should make it the same as that in ash for 
PRINT_UI_HIERARCHIES as if you're executing that accelerator you likely want to
see all the windows too. WDYT?

       ui::EF_CONTROL_DOWN | ui::EF_ALT_DOWN | ui::EF_SHIFT_DOWN};
   debug_accelerators_.push_back(accelerator);
 }
 
 void WindowManagerState::ProcessDebugAccelerator(const ui::Event& event) {
   if (event.type() != ui::ET_KEY_PRESSED)
     return;
 
   const ui::KeyEvent& key_event = *event.AsKeyEvent();
   for (const DebugAccelerator& accelerator : debug_accelerators_) {
@@ skipping 185 matching lines @@
       window->RemoveObserver(this);
       orphaned_window_manager_display_roots_.erase(iter);
       return;
     }
   }
   NOTREACHED();
 }
 
 }  // namespace ws
 }  // namespace ui