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

ios/web/web_state/web_state_impl.h

Index: ios/web/web_state/web_state_impl.h
diff --git a/ios/web/web_state/web_state_impl.h b/ios/web/web_state/web_state_impl.h
index 05a2869e46b46130c0c785491ed413991d447ab5..d28f281bbc3ddc04425c8526e5b16862f8a55bcd 100644
--- a/ios/web/web_state/web_state_impl.h
+++ b/ios/web/web_state/web_state_impl.h
@@ -63,9 +63,9 @@ class WebUIIOS;
 class WebStateImpl : public WebState, public NavigationManagerDelegate {
  public:
   // Constructor for WebStateImpls created for new sessions.
-  WebStateImpl(BrowserState* browser_state);
+  WebStateImpl(const CreateParams& params);
   // Constructor for WebStatesImpls created for deserialized sessions
-  WebStateImpl(BrowserState* browser_state, CRWSessionStorage* session_storage);
+  WebStateImpl(const CreateParams& params, CRWSessionStorage* session_storage);
   ~WebStateImpl() override;
 
   // Gets/Sets the CRWWebController that backs this object.
@@ -233,6 +233,7 @@ class WebStateImpl : public WebState, public NavigationManagerDelegate {
   void RemoveScriptCommandCallback(const std::string& command_prefix) override;
   id<CRWWebViewProxy> GetWebViewProxy() const override;
   service_manager::InterfaceRegistry* GetMojoInterfaceRegistry() override;
+  bool IsOpenedByDOM() const override;
   base::WeakPtr<WebState> AsWeakPtr() override;
 
   // Adds |interstitial|'s view to the web controller's content view.
@@ -360,6 +361,9 @@ class WebStateImpl : public WebState, public NavigationManagerDelegate {
   // Callbacks associated to command prefixes.
   std::map<std::string, ScriptCommandCallback> script_command_callbacks_;
 
+  // Whether this WebState is associated with a session opened via window.open.
+  bool opened_by_dom_;
+
   // Member variables should appear before the WeakPtrFactory<> to ensure that
   // any WeakPtrs to WebStateImpl are invalidated before its member variable's
   // destructors are executed, rendering them invalid.