headless: Introduce a browser context

headless/app/headless_shell.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 <iostream>
 #include <memory>
 #include <string>
 
 #include "base/base64.h"
 #include "base/bind.h"
@@ skipping 38 matching lines @@
   HeadlessShell()
       : browser_(nullptr),
         devtools_client_(HeadlessDevToolsClient::Create()),
         web_contents_(nullptr),
         processed_page_ready_(false) {}
   ~HeadlessShell() override {}
 
   void OnStart(HeadlessBrowser* browser) {
     browser_ = browser;
 
+    HeadlessWebContents::Builder builder(browser_->CreateWebContentsBuilder());
     base::CommandLine::StringVector args =
         base::CommandLine::ForCurrentProcess()->GetArgs();
 
-    const char kDefaultUrl[] = "about:blank";
-    if (args.empty() || args[0].empty()) {
-      url_ = GURL(kDefaultUrl);
-    } else {
-      url_ = GURL(args[0]);
-    }
+    if (!args.empty() && !args[0].empty())
+      builder.SetInitialURL(GURL(args[0]));
 
-    web_contents_ = browser->CreateWebContents(url_, gfx::Size(800, 600));
+    web_contents_ = builder.Build();
     if (!web_contents_) {
       LOG(ERROR) << "Navigation failed";
       browser_->Shutdown();
       return;
     }
     web_contents_->AddObserver(this);
   }
 
   void Shutdown() {
     if (!web_contents_)
@@ skipping 253 matching lines @@
 
   if (command_line.HasSwitch(switches::kHostResolverRules)) {
     builder.SetHostResolverRules(
         command_line.GetSwitchValueASCII(switches::kHostResolverRules));
   }
 
   return HeadlessBrowserMain(
       builder.Build(),
       base::Bind(&HeadlessShell::OnStart, base::Unretained(&shell)));
 }