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

chrome/browser/ui/browser_navigator_params.h

Index: chrome/browser/ui/browser_navigator_params.h
diff --git a/chrome/browser/ui/browser_navigator_params.h b/chrome/browser/ui/browser_navigator_params.h
index bf40e6781e709db6d8311cab5e6e07366d3a143d..77c03c1285a594269660ded957e6ed9a39973027 100644
--- a/chrome/browser/ui/browser_navigator_params.h
+++ b/chrome/browser/ui/browser_navigator_params.h
@@ -132,6 +132,12 @@ struct NavigateParams {
   // |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;