Upstream most of ios/web/net

ios/web/net/request_tracker_factory_impl.mm

Index: ios/web/net/request_tracker_factory_impl.mm
diff --git a/ios/web/net/request_tracker_factory_impl.mm b/ios/web/net/request_tracker_factory_impl.mm
new file mode 100644
index 0000000000000000000000000000000000000000..8973d3c3a77fc6d0ed2f5743c9082fac4bef2e93
--- /dev/null
+++ b/ios/web/net/request_tracker_factory_impl.mm
@@ -0,0 +1,49 @@
+// 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 "ios/web/net/request_tracker_factory_impl.h"
+
+#include "base/logging.h"
+#include "base/memory/weak_ptr.h"
+#include "base/strings/sys_string_conversions.h"
+#include "ios/web/net/request_group_util.h"
+#include "ios/web/net/request_tracker_impl.h"
+
+namespace web {
+
+RequestTrackerFactoryImpl::RequestTrackerFactoryImpl(
+    const std::string& application_scheme) {
+  if (!application_scheme.empty()) {
+    application_scheme_.reset(
+        [base::SysUTF8ToNSString(application_scheme) copy]);
+    DCHECK(application_scheme_);
+  }
+}
+
+RequestTrackerFactoryImpl::~RequestTrackerFactoryImpl() {
+}
+
+bool RequestTrackerFactoryImpl::GetRequestTracker(
+    NSURLRequest* request,
+    base::WeakPtr<net::RequestTracker>* tracker) {
+  DCHECK(tracker);
+  DCHECK(!tracker->get());
+  NSString* request_group_id =
+      web::ExtractRequestGroupIDFromRequest(request, application_scheme_);
+  if (!request_group_id) {
+    // There was no request_group_id, so the request was from something like a
+    // data: or file: URL.
+    return true;
+  }
+  RequestTrackerImpl* tracker_impl =
+      RequestTrackerImpl::GetTrackerForRequestGroupID(request_group_id);
+  if (tracker_impl)
+    *tracker = tracker_impl->GetWeakPtr();
+  // If there is a request group ID, but no associated tracker, return false.
+  // This usually happens when the tab has been closed, but can maybe also
+  // happen in other cases (see http://crbug.com/228397).
+  return tracker->get() != nullptr;
+}
+
+}  // namespace web