Moved |openedByDOM| to WebState's CreateParams and public interface.

ios/web/public/web_state/web_state.h

Index: ios/web/public/web_state/web_state.h
diff --git a/ios/web/public/web_state/web_state.h b/ios/web/public/web_state/web_state.h
index 5010d435b604af0f80bef362f2d8c4d64ebc18d1..d3aedcc8e4c3bd66134cf243258240bfd49c3e50 100644
--- a/ios/web/public/web_state/web_state.h
+++ b/ios/web/public/web_state/web_state.h
@@ -57,7 +57,11 @@ class WebState : public base::SupportsUserData {
     explicit CreateParams(web::BrowserState* browser_state);
     ~CreateParams();
 
+    // The corresponding BrowserState for the new WebState.
     web::BrowserState* browser_state;
+
+    // Whether the WebState is created as the result of a window.open

[Eugene But (OOO till 7-30), 2017/03/18 00:33:30]

Could you please update the comment:

Whether this WebState was created via a call to window.open or by clicking a
link with a blank target. Used when determining whether the WebState is allowed
to be closed via window.close(). May be true even with a null |opener| (e.g.,
for blocked popups).

[kkhorimoto, 2017/03/20 22:39:20]

Done, although I left out the last sentence since our CreateParams don't include
|opener|.

+    bool created_with_opener;
   };
 
   // Parameters for the OpenURL() method.
@@ -231,6 +235,10 @@ class WebState : public base::SupportsUserData {
   // Returns Mojo interface registry for this WebState.
   virtual service_manager::InterfaceRegistry* GetMojoInterfaceRegistry() = 0;
 
+  // Returns whether this WebState was created via a call to window.open or by
+  // clicking a link with a blank targer.

[Eugene But (OOO till 7-30), 2017/03/18 00:33:30]

How about this comment?:
Whether this WebState was created with an opener. See
CreateParams::created_with_opener comment for details.

[kkhorimoto, 2017/03/20 22:39:20]

Done.

+  virtual bool HasOpener() const = 0;
+
  protected:
   friend class WebStateObserver;
   friend class WebStatePolicyDecider;