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

chrome/browser/ui/browser_navigator_params.h

 // Copyright 2015 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 CHROME_BROWSER_UI_BROWSER_NAVIGATOR_PARAMS_H_
 #define CHROME_BROWSER_UI_BROWSER_NAVIGATOR_PARAMS_H_
 
 #include <string>
 #include <vector>
 
@@ skipping 114 matching lines @@
   // CURRENT_TAB          "     "     "                     NEW_FOREGROUND_TAB
   // OFF_THE_RECORD       target browser profile is incog.  NEW_FOREGROUND_TAB
   //
   // If disposition is NEW_BACKGROUND_TAB, TabStripModel::ADD_ACTIVE is
   // removed from |tabstrip_add_types| automatically.
   // If disposition is one of NEW_WINDOW, NEW_POPUP, NEW_FOREGROUND_TAB or
   // SINGLETON_TAB, then TabStripModel::ADD_ACTIVE is automatically added to
   // |tabstrip_add_types|.
   WindowOpenDisposition disposition;
 
+  // Controls creation of new web contents (in case |disposition| asks for a new
+  // tab or window).  If |force_new_renderer_for_new_contents| is true, then we
+  // try to put the new contents in a new renderer, even if they are same-site
+  // as |source_site_instance| (this is subject to renderer process limits).
+  bool force_new_renderer_for_new_contents;

[sky, 2017/04/20 21:00:57]

I find the use of renderer mildly confusing here. WDYT of new_process? Also,
please initialize this value. I'm ok with doing it right here. 

[Łukasz Anforowicz, 2017/04/20 21:56:05]

Done.
Doh... Thanks for catching this.  I've thought I've added initialization when
posting https://codereview.chromium.org/2686943002/#msg61, but apparently I've
made changes and uploaded in a wrong CL
(https://codereview.chromium.org/2680353005/#ps140001) and then these changes
got lost in rebasing...
I've added initializers to the constructors for consistency with the old code.

+
   // Sets browser->is_trusted_source. Default is false.
   bool trusted_source;
 
   // The transition type of the navigation. Default is
   // ui::PAGE_TRANSITION_LINK when target_contents is specified in the
   // constructor.
   ui::PageTransition transition;
 
   // Whether this navigation was initiated by the renderer process. Default is
   // false.
@@ skipping 102 matching lines @@
   NavigateParams();
 };
 
 // Copies fields from |params| struct to |nav_params| struct.
 void FillNavigateParamsFromOpenURLParams(chrome::NavigateParams* nav_params,
                                          const content::OpenURLParams& params);
 
 }  // namespace chrome
 
 #endif  // CHROME_BROWSER_UI_BROWSER_NAVIGATOR_PARAMS_H_