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

ios/web/webui/url_data_manager_ios.h

-// Copyright (c) 2012 The Chromium Authors. All rights reserved.
+// 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 CONTENT_BROWSER_WEBUI_URL_DATA_MANAGER_H_
-#define CONTENT_BROWSER_WEBUI_URL_DATA_MANAGER_H_
+#ifndef IOS_WEB_WEBUI_URL_DATA_MANAGER_IOS_H_
+#define IOS_WEB_WEBUI_URL_DATA_MANAGER_IOS_H_
 
 #include <string>
 #include <vector>
 
 #include "base/memory/ref_counted.h"
 #include "base/supports_user_data.h"
-#include "content/common/content_export.h"
 
-namespace content {
-class BrowserContext;
-class URLDataSource;
-class URLDataSourceImpl;
-class WebUIDataSource;
+namespace web {
+class BrowserState;
+class URLDataSourceIOS;
+class URLDataSourceIOSImpl;
+class WebUIIOSDataSource;
 
 // To serve dynamic data off of chrome: URLs, implement the
-// URLDataManager::DataSource interface and register your handler
+// URLDataManagerIOS::DataSource interface and register your handler
 // with AddDataSource. DataSources must be added on the UI thread (they are also
 // deleted on the UI thread). Internally the DataSources are maintained by
-// URLDataManagerBackend, see it for details.
-class CONTENT_EXPORT URLDataManager : public base::SupportsUserData::Data {
+// URLDataManagerIOSBackend, see it for details.
+class URLDataManagerIOS : public base::SupportsUserData::Data {
  public:
-  explicit URLDataManager(BrowserContext* browser_context);
-  ~URLDataManager() override;
+  explicit URLDataManagerIOS(BrowserState* browser_state);
+  ~URLDataManagerIOS() override;
 
   // Adds a DataSource to the collection of data sources. This *must* be invoked
   // on the UI thread.
   //
   // If |AddDataSource| is called more than once for a particular name it will
   // release the old |DataSource|, most likely resulting in it getting deleted
   // as there are no other references to it. |DataSource| uses the
   // |DeleteOnUIThread| trait to insure that the destructor is called on the UI
   // thread. This is necessary as some |DataSource|s notably |FileIconSource|
   // and |FaviconSource|, have members that will DCHECK if they are not
   // destructed in the same thread as they are constructed (the UI thread).
-  void AddDataSource(URLDataSourceImpl* source);
+  void AddDataSource(URLDataSourceIOSImpl* source);
 
   // Deletes any data sources no longer referenced. This is normally invoked
   // for you, but can be invoked to force deletion (such as during shutdown).
   static void DeleteDataSources();
 
   // Convenience wrapper function to add |source| to |browser_context|'s
-  // |URLDataManager|. Creates a URLDataSourceImpl to wrap the given
+  // |URLDataManagerIOS|. Creates a URLDataSourceIOSImpl to wrap the given
   // source.
-  static void AddDataSource(BrowserContext* browser_context,
-                            URLDataSource* source);
+  static void AddDataSource(BrowserState* browser_context,
+                            URLDataSourceIOS* source);
 
-  // Adds a WebUI data source to |browser_context|'s |URLDataManager|.
-  static void AddWebUIDataSource(BrowserContext* browser_context,
-                                 WebUIDataSource* source);
+  // Adds a WebUI data source to |browser_context|'s |URLDataManagerIOS|.
+  static void AddWebUIIOSDataSource(BrowserState* browser_state,
+                                    WebUIIOSDataSource* source);
 
  private:
-  friend class URLDataSourceImpl;
-  friend struct DeleteURLDataSource;
-  typedef std::vector<const URLDataSourceImpl*> URLDataSources;
+  friend class URLDataSourceIOSImpl;
+  friend struct DeleteURLDataSourceIOS;
+  typedef std::vector<const URLDataSourceIOSImpl*> URLDataSources;
+
+  // Invoked on the IO thread to do the actual adding of the DataSource.
+  static void AddDataSourceOnIOThread(
+      BrowserState* browser_state,
+      scoped_refptr<URLDataSourceIOSImpl> data_source);
 
   // If invoked on the UI thread the DataSource is deleted immediatlye,
   // otherwise it is added to |data_sources_| and a task is scheduled to handle
   // deletion on the UI thread. See note abouve DeleteDataSource for more info.
-  static void DeleteDataSource(const URLDataSourceImpl* data_source);
+  static void DeleteDataSource(const URLDataSourceIOSImpl* data_source);
 
   // Returns true if |data_source| is scheduled for deletion (|DeleteDataSource|
   // was invoked).
-  static bool IsScheduledForDeletion(const URLDataSourceImpl* data_source);
+  static bool IsScheduledForDeletion(const URLDataSourceIOSImpl* data_source);
 
-  BrowserContext* browser_context_;
+  BrowserState* browser_state_;
 
   // |data_sources_| that are no longer referenced and scheduled for deletion.
   // Protected by g_delete_lock in the .cc file.
   static URLDataSources* data_sources_;
 
-  DISALLOW_COPY_AND_ASSIGN(URLDataManager);
+  DISALLOW_COPY_AND_ASSIGN(URLDataManagerIOS);
 };
 
-}  // namespace content
+}  // namespace web
 
-#endif  // CONTENT_BROWSER_WEBUI_URL_DATA_MANAGER_H_
+#endif  // IOS_WEB_WEBUI_URL_DATA_MANAGER_IOS_H_