Override CreateNewTarget in the HeadlessDevToolsManagerDelegate to be able to create new tabs in he…

headless/lib/browser/headless_devtools_manager_delegate.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 "headless/lib/browser/headless_devtools_manager_delegate.h"
 
 #include <string>
 #include <utility>
 
 #include "content/public/browser/browser_thread.h"
@@ skipping 90 matching lines @@
   if (find_it == command_map_.end())
     return nullptr;
   CommandMemberFnPtr command_fn_ptr = find_it->second;
   const base::DictionaryValue* params = nullptr;
   command->GetDictionary("params", &params);
   std::unique_ptr<base::DictionaryValue> cmd_result(
       ((this)->*command_fn_ptr)(id, params));
   return cmd_result.release();
 }
 
+scoped_refptr<content::DevToolsAgentHost>
+HeadlessDevToolsManagerDelegate::CreateNewTarget(const GURL& url) {
+  HeadlessBrowserContext* context = browser_->GetDefaultBrowserContext();
+  HeadlessWebContentsImpl* web_contents_impl = HeadlessWebContentsImpl::From(
+      context->CreateWebContentsBuilder()
+          .SetInitialURL(url)
+          .SetWindowSize(browser_->options()->window_size)
+          .Build());
+  return content::DevToolsAgentHost::GetOrCreateFor(
+      web_contents_impl->web_contents());
+}
+
 std::string HeadlessDevToolsManagerDelegate::GetDiscoveryPageHTML() {
   return ResourceBundle::GetSharedInstance()
       .GetRawDataResource(IDR_HEADLESS_LIB_DEVTOOLS_DISCOVERY_PAGE)
       .as_string();
 }
 
 std::string HeadlessDevToolsManagerDelegate::GetFrontendResource(
     const std::string& path) {
   return content::DevToolsFrontendHost::GetFrontendResource(path).as_string();
 }
@@ skipping 97 matching lines @@
 
   std::unique_ptr<base::Value> result(
       target::DisposeBrowserContextResult::Builder()
           .SetSuccess(success)
           .Build()
           ->Serialize());
   return CreateSuccessResponse(command_id, std::move(result));
 }
 
 }  // namespace headless