Implement window management devtools commands for headless.

headless/lib/browser/headless_browser_context_options.h

 // 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.
 
 #ifndef HEADLESS_LIB_BROWSER_HEADLESS_BROWSER_CONTEXT_OPTIONS_H_
 #define HEADLESS_LIB_BROWSER_HEADLESS_BROWSER_CONTEXT_OPTIONS_H_
 
 #include <string>
 
 #include "base/callback.h"
@@ skipping 18 matching lines @@
   const std::string& product_name_and_version() const;
   const std::string& user_agent() const;
 
   // See HeadlessBrowser::Options::proxy_server.
   const net::HostPortPair& proxy_server() const;
 
   // See HeadlessBrowser::Options::host_resolver_rules.
   const std::string& host_resolver_rules() const;
 
   const gfx::Size& window_size() const;
+  const gfx::Size& screen_size() const;
 
   // See HeadlessBrowser::Options::user_data_dir.
   const base::FilePath& user_data_dir() const;
 
   // Set HeadlessBrowser::Options::incognito_mode.
   bool incognito_mode() const;
 
   // Custom network protocol handlers. These can be used to override URL
   // fetching for different network schemes.
   const ProtocolHandlerMap& protocol_handlers() const;
@@ skipping 22 matching lines @@
       override_web_preferences_callback_;
 
   ProtocolHandlerMap protocol_handlers_;
 
   DISALLOW_COPY_AND_ASSIGN(HeadlessBrowserContextOptions);
 };
 
 }  // namespace headless
 
 #endif  // HEADLESS_LIB_BROWSER_HEADLESS_BROWSER_CONTEXT_OPTIONS_H_