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 c54cbad34544e7e05d76704662209acf42d30efc..1e65c1c707aa6c58868261b70111b3f8c1fe4f95 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
+    bool opened_by_dom;

[Eugene But (OOO till 7-30), 2017/03/16 15:31:19]

Content has this boolean, which actually better represents the intent of this
API:
bool created_with_opener;

[kkhorimoto, 2017/03/17 23:04:49]

Done.

   };
 
   // Parameters for the OpenURL() method.
@@ -230,6 +234,10 @@ 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.
+  virtual bool IsOpenedByDOM() const = 0;

[Eugene But (OOO till 7-30), 2017/03/16 15:31:19]

Is this the same as content's HasOpener() ?

[kkhorimoto, 2017/03/17 23:04:49]

Yes, it looks like it.  I've updated the naming.

+
  protected:
   friend class WebStateObserver;
   friend class WebStatePolicyDecider;