DevTools: enable target domain handler on the browser target, make browser target non-discoverable.

chrome/browser/devtools/chrome_devtools_manager_delegate.cc

 // Copyright 2014 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 "chrome/browser/devtools/chrome_devtools_manager_delegate.h"
 
+#include "base/guid.h"
 #include "base/memory/ptr_util.h"
 #include "base/strings/utf_string_conversions.h"
 #include "build/build_config.h"
 #include "chrome/browser/devtools/device/android_device_manager.h"
 #include "chrome/browser/devtools/device/tcp_device_provider.h"
 #include "chrome/browser/devtools/devtools_network_protocol_handler.h"
 #include "chrome/browser/devtools/devtools_protocol_constants.h"
 #include "chrome/browser/devtools/devtools_window.h"
 #include "chrome/browser/extensions/extension_tab_util.h"
 #include "chrome/browser/profiles/profile.h"
@@ skipping 142 matching lines @@
 std::string ChromeDevToolsManagerDelegate::GetDiscoveryPageHTML() {
   return ResourceBundle::GetSharedInstance().GetRawDataResource(
       IDR_DEVTOOLS_DISCOVERY_PAGE_HTML).as_string();
 }
 
 std::string ChromeDevToolsManagerDelegate::GetFrontendResource(
     const std::string& path) {
   return content::DevToolsFrontendHost::GetFrontendResource(path).as_string();
 }
 
+std::string ChromeDevToolsManagerDelegate::GetBrowserTargetGUID() {
+  CR_DEFINE_STATIC_LOCAL(std::string, guid, (base::GenerateGUID()));
+  return guid;
+}
+
 void ChromeDevToolsManagerDelegate::DevToolsAgentHostAttached(
     content::DevToolsAgentHost* agent_host) {
   network_protocol_handler_->DevToolsAgentStateChanged(agent_host, true);
 }
 
 void ChromeDevToolsManagerDelegate::DevToolsAgentHostDetached(
     content::DevToolsAgentHost* agent_host) {
   if (agent_host == remote_locations_requester_) {
     remote_locations_requester_ = nullptr;
     device_discovery_.reset();
@@ skipping 52 matching lines @@
 
     device_discovery_.reset(new DevToolsDeviceDiscovery(device_manager_.get(),
         base::Bind(&ChromeDevToolsManagerDelegate::DevicesAvailable,
                    base::Unretained(this))));
   }
 
   std::unique_ptr<base::DictionaryValue> result(
       base::MakeUnique<base::DictionaryValue>());
   return DevToolsProtocol::CreateSuccessResponse(command_id, std::move(result));
 }