merge(3p/abseil_cpp): Merge upstream at 'ccdbb5941'

Change-Id: I6e85fc7b5f76bba1f1eef15e600a8acb64e97ef5

third_party/abseil_cpp/absl/flags/commandlineflag.cc

@@ -0,0 +1,38 @@
+//
+// Copyright 2020 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/flags/commandlineflag.h"
+
+#include <string>
+
+#include "absl/base/config.h"
+#include "absl/flags/internal/commandlineflag.h"
+#include "absl/strings/string_view.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+
+bool CommandLineFlag::IsRetired() const { return false; }
+bool CommandLineFlag::ParseFrom(absl::string_view value, std::string* error) {
+  return ParseFrom(value, flags_internal::SET_FLAGS_VALUE,
+                   flags_internal::kProgrammaticChange, *error);
+}
+
+namespace flags_internal {
+FlagStateInterface::~FlagStateInterface() {}
+}  // namespace flags_internal
+ABSL_NAMESPACE_END
+}  // namespace absl
+