1 files changed, 59 insertions, 0 deletions
diff --git a/third_party/libwebrtc/rtc_base/experiments/field_trial_list.cc b/third_party/libwebrtc/rtc_base/experiments/field_trial_list.cc
new file mode 100644
index 0000000000..72cd79f2d2
--- /dev/null
+++ b/third_party/libwebrtc/rtc_base/experiments/field_trial_list.cc
@@ -0,0 +1,59 @@
+/*
+ *  Copyright 2019 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+#include "rtc_base/experiments/field_trial_list.h"
+
+#include "absl/strings/string_view.h"
+
+namespace webrtc {
+
+FieldTrialListBase::FieldTrialListBase(absl::string_view key)
+    : FieldTrialParameterInterface(key),
+      failed_(false),
+      parse_got_called_(false) {}
+
+bool FieldTrialListBase::Failed() const {
+  return failed_;
+}
+bool FieldTrialListBase::Used() const {
+  return parse_got_called_;
+}
+
+int FieldTrialListWrapper::Length() {
+  return GetList()->Size();
+}
+bool FieldTrialListWrapper::Failed() {
+  return GetList()->Failed();
+}
+bool FieldTrialListWrapper::Used() {
+  return GetList()->Used();
+}
+
+bool FieldTrialStructListBase::Parse(absl::optional<std::string> str_value) {
+  RTC_DCHECK_NOTREACHED();
+  return true;
+}
+
+int FieldTrialStructListBase::ValidateAndGetLength() {
+  int length = -1;
+  for (std::unique_ptr<FieldTrialListWrapper>& list : sub_lists_) {
+    if (list->Failed())
+      return -1;
+    else if (!list->Used())
+      continue;
+    else if (length == -1)
+      length = list->Length();
+    else if (length != list->Length())
+      return -1;
+  }
+
+  return length;
+}
+
+}  // namespace webrtc