Upstream most of the iOS WebUI support in ios/web/

ios/public/provider/web/web_ui_ios.h

Index: ios/public/provider/web/web_ui_ios.h
diff --git a/ios/public/provider/web/web_ui_ios.h b/ios/public/provider/web/web_ui_ios.h
new file mode 100644
index 0000000000000000000000000000000000000000..4a88043f23670b1e91d8a0f4406580fe67507611
--- /dev/null
+++ b/ios/public/provider/web/web_ui_ios.h
@@ -0,0 +1,87 @@
+// Copyright 2014 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_PUBLIC_PROVIDER_WEB_WEB_UI_IOS_H_
+#define IOS_PUBLIC_PROVIDER_WEB_WEB_UI_IOS_H_
+
+#include <vector>
+
+#include "base/basictypes.h"
+#include "base/callback.h"
+#include "base/strings/string16.h"
+
+class GURL;
+
+namespace base {
+class ListValue;
+class Value;
+}
+
+namespace web {
+
+class WebState;
+class WebUIIOSController;
+class WebUIIOSMessageHandler;
+
+// A WebUIIOS sets up the datasources and message handlers for a given
+// HTML-based UI.
+class WebUIIOS {
+ public:
+  // Returns JavaScript code that, when executed, calls the function specified
+  // by |function_name| with the arguments specified in |arg_list|.
+  static base::string16 GetJavascriptCall(
+      const std::string& function_name,
+      const std::vector<const base::Value*>& arg_list);
+
+  virtual ~WebUIIOS() {}
+

[Eugene But (OOO till 7-30), 2015/04/28 20:23:01]

NIT: Do you need comments for these?

+  virtual web::WebState* GetWebState() const = 0;
+
+  virtual WebUIIOSController* GetController() const = 0;
+  virtual void SetController(WebUIIOSController* controller) = 0;
+
+  // Takes ownership of |handler|, which will be destroyed when the WebUIIOS is.
+  virtual void AddMessageHandler(WebUIIOSMessageHandler* handler) = 0;
+
+  // Used by WebUIIOSMessageHandlers. If the given message is already
+  // registered, the call has no effect unless |register_callback_overwrites_|
+  // is set to true.
+  typedef base::Callback<void(const base::ListValue*)> MessageCallback;
+  virtual void RegisterMessageCallback(const std::string& message,
+                                       const MessageCallback& callback) = 0;
+
+  // This is only needed if an embedder overrides handling of a WebUIIOSMessage
+  // and then later wants to undo that, or to route it to a different WebUIIOS
+  // object.
+  virtual void ProcessWebUIIOSMessage(const GURL& source_url,
+                                      const std::string& message,
+                                      const base::ListValue& args) = 0;
+
+  // Call a Javascript function.  This is asynchronous; there's no way to get
+  // the result of the call, and should be thought of more like sending a
+  // message to the page.  All function names in WebUI must consist of only
+  // ASCII characters.  There are variants for calls with more arguments.
+  virtual void CallJavascriptFunction(const std::string& function_name) = 0;
+  virtual void CallJavascriptFunction(const std::string& function_name,
+                                      const base::Value& arg) = 0;
+  virtual void CallJavascriptFunction(const std::string& function_name,
+                                      const base::Value& arg1,
+                                      const base::Value& arg2) = 0;
+  virtual void CallJavascriptFunction(const std::string& function_name,
+                                      const base::Value& arg1,
+                                      const base::Value& arg2,
+                                      const base::Value& arg3) = 0;
+  virtual void CallJavascriptFunction(const std::string& function_name,
+                                      const base::Value& arg1,
+                                      const base::Value& arg2,
+                                      const base::Value& arg3,
+                                      const base::Value& arg4) = 0;
+  virtual void CallJavascriptFunction(
+      const std::string& function_name,
+      const std::vector<const base::Value*>& args) = 0;
+};
+
+}  // namespace web
+
+#endif  // IOS_PUBLIC_PROVIDER_WEB_WEB_UI_IOS_H_