mash: Store chrome --mash crash key metadata in shared memory

ash/common/accelerators/debug_commands.cc

 // Copyright 2013 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 "ash/common/accelerators/debug_commands.h"
 
 #include "ash/common/accelerators/accelerator_commands.h"
 #include "ash/common/ash_switches.h"
 #include "ash/common/shell_delegate.h"
 #include "ash/common/system/toast/toast_data.h"
 #include "ash/common/system/toast/toast_manager.h"
 #include "ash/common/wallpaper/wallpaper_controller.h"
 #include "ash/common/wallpaper/wallpaper_delegate.h"
 #include "ash/common/wm/maximize_mode/maximize_mode_controller.h"
 #include "ash/common/wm_shell.h"
 #include "ash/common/wm_window.h"
 #include "ash/common/wm_window_property.h"
 #include "ash/root_window_controller.h"
 #include "base/command_line.h"
+#include "base/debug/crash_logging.h"
 #include "base/metrics/user_metrics.h"
 #include "base/metrics/user_metrics_action.h"
 #include "base/strings/utf_string_conversions.h"
 #include "ui/compositor/debug_utils.h"
 #include "ui/compositor/layer.h"
 #include "ui/gfx/canvas.h"
 #include "ui/gfx/image/image_skia.h"
 #include "ui/views/debug_utils.h"
 #include "ui/views/widget/widget.h"
 
@@ skipping 112 matching lines @@
 }
 
 void HandleToggleTouchView() {
   MaximizeModeController* controller =
       WmShell::Get()->maximize_mode_controller();
   controller->EnableMaximizeModeWindowManager(
       !controller->IsMaximizeModeWindowManagerEnabled());
 }
 
 void HandleTriggerCrash() {
+  // Allow manual testing of crash keys.
+  base::debug::SetCrashKeyValue("url-chunk", "crash-url-chunk-for-testing");

[hashimoto, 2017/03/02 07:42:22]

This line depends on chrome/common/crash_keys.cc to register kActiveURL
(="url-chunk") as a crash key, when running as part of chrome, right?
IIUC ash shouldn't depend on chrome so please avoid doing this.

   CHECK(false) << "Intentional crash via debug accelerator.";
 }
 
 }  // namespace
 
 void PrintUIHierarchies() {
   // This is a separate command so the user only has to hit one key to generate
   // all the logs. Developers use the individual dumps repeatedly, so keep
   // those as separate commands to avoid spamming their logs.
   HandlePrintLayerHierarchy();
@@ skipping 45 matching lines @@
     case DEBUG_TRIGGER_CRASH:
       HandleTriggerCrash();
       break;
     default:
       break;
   }
 }
 
 }  // namespace debug
 }  // namespace ash