Upstream ios/web/web_state/ui support classes

ios/web/web_state/ui/wk_web_view_configuration_provider.h

Index: ios/web/web_state/ui/wk_web_view_configuration_provider.h
diff --git a/ios/web/web_state/ui/wk_web_view_configuration_provider.h b/ios/web/web_state/ui/wk_web_view_configuration_provider.h
new file mode 100644
index 0000000000000000000000000000000000000000..e65523f6edbaed0edd7316165603095d0ea3b383
--- /dev/null
+++ b/ios/web/web_state/ui/wk_web_view_configuration_provider.h
@@ -0,0 +1,65 @@
+// 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 IOS_WEB_WEB_STATE_UI_WK_WEB_VIEW_CONFIGURATION_PROVIDER_H_
+#define IOS_WEB_WEB_STATE_UI_WK_WEB_VIEW_CONFIGURATION_PROVIDER_H_
+
+#include "base/mac/scoped_nsobject.h"
+#include "base/macros.h"
+#include "base/supports_user_data.h"
+
+@class CRWWKScriptMessageRouter;
+@class WKWebViewConfiguration;
+
+namespace web {
+
+class BrowserState;
+
+// A provider class associated with a single web::BrowserState object. Manages
+// the lifetime and performs setup of WKWebViewConfiguration and
+// CRWWKScriptMessageRouter instances. Not threadsafe. Must be used only on the
+// main thread.
+class WKWebViewConfigurationProvider : public base::SupportsUserData::Data {
+ public:
+  // Returns a provider for the given |browser_state|. Lazily attaches one if it
+  // does not exist. |browser_state| can not be null.
+  static web::WKWebViewConfigurationProvider& FromBrowserState(
+      web::BrowserState* browser_state);
+
+  // Returns an autoreleased copy of WKWebViewConfiguration associated with
+  // browser state. Lazily creates the config. Configuration's |preferences|
+  // will have scriptCanOpenWindowsAutomatically property set to YES.
+  // Must be used instead of [[WKWebViewConfiguration alloc] init].
+  // Callers must not retain the returned object.
+  WKWebViewConfiguration* GetWebViewConfiguration();
+
+  // Returns CRWWKScriptMessafeRouter associated with WKWebViewConfiguration.
+  // Lazily creates the router. Callers must not retain the returned object
+  // (this will be enforced in debug builds).
+  CRWWKScriptMessageRouter* GetScriptMessageRouter();

[Eugene But (OOO till 7-30), 2015/03/30 05:03:58]

Optional: Could you please exclude this file from CL. I will upstream it after I
remove CRWWKScriptMessageRouter.

[stuartmorgan, 2015/03/30 14:17:57]

Done.

+
+  // Returns true if this object holds a valid config. false if
+  // |GetWebViewConfiguration| was never called or configuration was purged by
+  // calling |Purge|.
+  bool HasWebViewConfiguration() const;
+
+  // Purges config and router objects if they exist. When this method is called
+  // config, config's process pool and router must not be retained by anyone
+  // (this will be enforced in debug builds). |HasWebViewConfiguration| will
+  // return false after config is purged.
+  void Purge();
+
+ private:
+  WKWebViewConfigurationProvider();
+  ~WKWebViewConfigurationProvider() override;
+
+  base::scoped_nsobject<WKWebViewConfiguration> configuration_;
+  base::scoped_nsobject<CRWWKScriptMessageRouter> router_;
+
+  DISALLOW_COPY_AND_ASSIGN(WKWebViewConfigurationProvider);
+};
+
+}  // namespace web
+
+#endif  // IOS_WEB_WEB_STATE_UI_WK_WEB_VIEW_CONFIGURATION_PROVIDER_H_