New WebContents created via ctrl-click should be in a new process.

content/public/browser/page_navigator.h

 // Copyright (c) 2012 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.
 
 // PageNavigator defines an interface that can be used to express the user's
 // intention to navigate to a particular URL.  The implementing class should
 // perform the navigation.
 
 #ifndef CONTENT_PUBLIC_BROWSER_PAGE_NAVIGATOR_H_
 #define CONTENT_PUBLIC_BROWSER_PAGE_NAVIGATOR_H_
@@ skipping 64 matching lines @@
 
   // Routing id of the source RenderFrameHost.
   int source_render_frame_id = MSG_ROUTING_NONE;
 
   // Process id of the source RenderFrameHost.
   int source_render_process_id = ChildProcessHost::kInvalidUniqueID;
 
   // The disposition requested by the navigation source.
   WindowOpenDisposition disposition;
 
+  // Controls whether newly created web contents (in case if |disposition| asks

[Charlie Reis, 2017/04/19 20:11:11]

nit: Drop "if"

[Łukasz Anforowicz, 2017/04/20 01:11:29]

Done.

+  // for a new tab or window) should attempt to reuse the renderer process of
+  // |source_site_instance|.  For example - new contents created after
+  // ctrl-clicking a link should use always a new renderer, but
+  // chrome.windows.create extensions API should try to keep the new contents in
+  // the same extension process (if same-site).
+  bool use_new_renderer_for_new_contents;
+
   // The transition type of navigation.
   ui::PageTransition transition;
 
   // Whether this navigation is initiated by the renderer process.
   bool is_renderer_initiated;
 
   // Indicates whether this navigation should replace the current
   // navigation entry.
   bool should_replace_current_entry;
 
@@ skipping 15 matching lines @@
   // Opens a URL with the given disposition.  The transition specifies how this
   // navigation should be recorded in the history system (for example, typed).
   // Returns the WebContents the URL is opened in, or nullptr if the URL wasn't
   // opened immediately.
   virtual WebContents* OpenURL(const OpenURLParams& params) = 0;
 };
 
 }  // namespace content
 
 #endif  // CONTENT_PUBLIC_BROWSER_PAGE_NAVIGATOR_H_