DevTools: provide the debugger detach reason in chrome.debugger.onDetach extension API.

chrome/browser/debugger/devtools_window.cc

 // Copyright (c) 2012 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 <algorithm>
 
 #include "base/command_line.h"
 #include "base/json/json_writer.h"
 #include "base/lazy_instance.h"
 #include "base/string_number_conversions.h"
 #include "base/stringprintf.h"
 #include "base/utf_string_conversions.h"
 #include "base/values.h"
 #include "chrome/browser/browser_process.h"
 #include "chrome/browser/debugger/devtools_window.h"
+#include "chrome/browser/extensions/api/debugger/debugger_api.h"
 #include "chrome/browser/extensions/extension_service.h"
 #include "chrome/browser/file_select_helper.h"
 #include "chrome/browser/prefs/pref_service.h"
 #include "chrome/browser/prefs/scoped_user_pref_update.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/sessions/session_tab_helper.h"
 #include "chrome/browser/themes/theme_service.h"
 #include "chrome/browser/themes/theme_service_factory.h"
 #include "chrome/browser/ui/browser.h"
 #include "chrome/browser/ui/browser_list.h"
@@ skipping 595 matching lines @@
     RenderViewHost* inspected_rvh,
     bool force_open,
     DevToolsToggleAction action) {
   DevToolsAgentHost* agent = DevToolsAgentHostRegistry::GetDevToolsAgentHost(
       inspected_rvh);
   DevToolsManager* manager = DevToolsManager::GetInstance();
   DevToolsClientHost* host = manager->GetDevToolsClientHostFor(agent);
   DevToolsWindow* window = AsDevToolsWindow(host);
   if (host && !window) {
     // Break remote debugging / extension debugging session.
+    DebuggerApi::MarkDevToolsClientHostAsReplaced(host);
     manager->UnregisterDevToolsClientHostFor(agent);
   }
 
   bool do_open = force_open;
   if (!window) {
     Profile* profile = Profile::FromBrowserContext(
         inspected_rvh->GetProcess()->GetBrowserContext());
     bool docked = profile->GetPrefs()->GetBoolean(prefs::kDevToolsOpenDocked);
     window = Create(profile, inspected_rvh, docked, false);
     manager->RegisterDevToolsClientHostFor(agent, window->frontend_host_);
@@ skipping 140 matching lines @@
   FileSelectHelper::RunFileChooser(web_contents, params);
 }
 
 void DevToolsWindow::UpdateBrowserToolbar() {
   if (!inspected_tab_)
     return;
   BrowserWindow* inspected_window = GetInspectedBrowserWindow();
   if (inspected_window)
     inspected_window->UpdateToolbar(inspected_tab_, false);
 }