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

ios/web/webui/url_data_source_ios_impl.cc

-// 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.
 
-#include "content/browser/webui/url_data_source_impl.h"
+#include "ios/web/webui/url_data_source_ios_impl.h"
 
 #include "base/bind.h"
+#include "base/location.h"
 #include "base/memory/ref_counted_memory.h"
 #include "base/strings/string_util.h"
-#include "content/browser/webui/url_data_manager_backend.h"
-#include "content/public/browser/browser_thread.h"
-#include "content/public/browser/url_data_source.h"
+#include "ios/web/public/url_data_source_ios.h"
+#include "ios/web/public/web_thread.h"
+#include "ios/web/webui/url_data_manager_ios_backend.h"
 
-namespace content {
+namespace web {
 
-URLDataSourceImpl::URLDataSourceImpl(const std::string& source_name,
-                                     URLDataSource* source)
-    : source_name_(source_name),
-      backend_(NULL),
-      source_(source) {
+URLDataSourceIOSImpl::URLDataSourceIOSImpl(const std::string& source_name,
+                                           URLDataSourceIOS* source)
+    : source_name_(source_name), backend_(NULL), source_(source) {
 }
 
-URLDataSourceImpl::~URLDataSourceImpl() {
+URLDataSourceIOSImpl::~URLDataSourceIOSImpl() {
 }
 
-void URLDataSourceImpl::SendResponse(
-    int request_id,
-    base::RefCountedMemory* bytes) {
+void URLDataSourceIOSImpl::SendResponse(int request_id,
+                                        base::RefCountedMemory* bytes) {
   // Take a ref-pointer on entry so byte->Release() will always get called.
   scoped_refptr<base::RefCountedMemory> bytes_ptr(bytes);
-  if (URLDataManager::IsScheduledForDeletion(this)) {
+  if (URLDataManagerIOS::IsScheduledForDeletion(this)) {
     // We're scheduled for deletion. Servicing the request would result in
     // this->AddRef being invoked, even though the ref count is 0 and 'this' is
     // about to be deleted. If the AddRef were allowed through, when 'this' is
     // released it would be deleted again.
     //
     // This scenario occurs with DataSources that make history requests. Such
     // DataSources do a history query in |StartDataRequest| and the request is
     // live until the object is deleted (history requests don't up the ref
     // count). This means it's entirely possible for the DataSource to invoke
     // |SendResponse| between the time when there are no more refs and the time
     // when the object is deleted.
     return;
   }
-  BrowserThread::PostTask(
-      BrowserThread::IO, FROM_HERE,
-      base::Bind(&URLDataSourceImpl::SendResponseOnIOThread, this, request_id,
-                 bytes_ptr));
+  web::WebThread::PostTask(
+      web::WebThread::IO, FROM_HERE,
+      base::Bind(&URLDataSourceIOSImpl::SendResponseOnIOThread, this,
+                 request_id, bytes_ptr));
 }
 
-void URLDataSourceImpl::SendResponseOnIOThread(
+void URLDataSourceIOSImpl::SendResponseOnIOThread(
     int request_id,
     scoped_refptr<base::RefCountedMemory> bytes) {
-  DCHECK_CURRENTLY_ON(BrowserThread::IO);
+  DCHECK_CURRENTLY_ON_WEB_THREAD(web::WebThread::IO);
   if (backend_)
     backend_->DataAvailable(request_id, bytes.get());
 }
 
-}  // namespace content
+}  // namespace web