headless: make initial screen/window sizes configurable.

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 "base/guid.h"
 #include "content/public/browser/web_contents.h"
@@ skipping 41 matching lines @@
   std::unique_ptr<base::DictionaryValue> result(new base::DictionaryValue());
   result->SetInteger("id", id);
   result->Set("result", std::move(cmd_result));
   return result.release();
 }
 
 std::unique_ptr<base::Value> HeadlessDevToolsManagerDelegate::CreateTarget(
     const base::DictionaryValue* params) {
   std::string url;
   std::string browser_context_id;
-  int width = 800;
-  int height = 600;
+  int width = browser_->options()->window_size.width();
+  int height = browser_->options()->window_size.height();
   params->GetString("url", &url);
   params->GetString("browserContextId", &browser_context_id);
   params->GetInteger("width", &width);
   params->GetInteger("height", &height);
   HeadlessWebContentsImpl* web_contents_impl;
   auto find_it = browser_context_map_.find(browser_context_id);
   if (find_it != browser_context_map_.end()) {
     web_contents_impl = HeadlessWebContentsImpl::From(
         browser_->CreateWebContentsBuilder()
             .SetInitialURL(GURL(url))
@@ skipping 71 matching lines @@
     if (success)
       browser_context_map_.erase(find_it);
   }
   return browser::DisposeBrowserContextResult::Builder()
       .SetSuccess(success)
       .Build()
       ->Serialize();
 }
 
 }  // namespace headless