Rebind mus keyboard shortcut for dump ServerWindow hierarchy to Ctrl-Alt-Shift-M

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 "base/memory/weak_ptr.h"
 #include "services/shell/public/interfaces/connector.mojom.h"
 #include "services/ui/common/event_matcher_util.h"
 #include "services/ui/ws/accelerator.h"
@@ skipping 349 matching lines @@
   // Ignore |tree| because it will receive the event via normal dispatch.
   window_server()->SendToEventObservers(event, user_id(), tree);
 
   tree->DispatchInputEvent(target, event);
 }
 
 void WindowManagerState::AddDebugAccelerators() {
   // Always register the accelerators, even if they only work in debug, so that
   // keyboard behavior is the same in release and debug builds.
   mojom::EventMatcherPtr matcher = CreateKeyMatcher(
-      ui::mojom::KeyboardCode::S, ui::mojom::kEventFlagControlDown |
+      ui::mojom::KeyboardCode::M, ui::mojom::kEventFlagControlDown |

[sky, 2016/08/01 20:43:20]

I think the wm should be able to override debug accelerators, otherwise we get
errors like we're seeing.

I also think debug accelerators should always be processed. So, if the wm binds
an accelerator mus defines both are processed.

                                       ui::mojom::kEventFlagAltDown |
                                       ui::mojom::kEventFlagShiftDown);
   event_dispatcher_.AddAccelerator(kPrintWindowsDebugAcceleratorId,
                                    std::move(matcher));
 }
 
 bool WindowManagerState::HandleDebugAccelerator(uint32_t accelerator_id) {
 #if !defined(NDEBUG)
   if (accelerator_id == kPrintWindowsDebugAcceleratorId) {
     // Error so it will be collected in system logs.
@@ skipping 148 matching lines @@
   return display_root ? display_root->root() : nullptr;
 }
 
 void WindowManagerState::OnEventTargetNotFound(const ui::Event& event) {
   window_server()->SendToEventObservers(event, user_id(),
                                         nullptr /* ignore_tree */);
 }
 
 }  // namespace ws
 }  // namespace ui