Initial implementation for sharing field trial state (win)

content/browser/browser_child_process_host_impl_unittest.cc

+// Copyright 2016 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/browser_child_process_host_impl.h"
+
+#include <string>
+
+#include "base/base_switches.h"
+#include "base/files/file_path.h"
+#include "base/memory/ptr_util.h"
+#include "base/metrics/field_trial.h"
+#include "base/test/mock_entropy_provider.h"
+#include "content/public/browser/browser_child_process_host_delegate.h"
+#include "content/public/common/content_switches.h"
+#include "content/public/common/service_names.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace content {
+
+TEST(BrowserChildProcessHostImplTest, TestCopyFeatureAndFieldTrialFlags) {
+  base::FieldTrialList field_trial_list(
+      base::MakeUnique<base::MockEntropyProvider>());
+  base::FieldTrialList::CreateFieldTrial("Trial1", "Group1");
+  base::FilePath test_file_path = base::FilePath(FILE_PATH_LITERAL("Program"));
+  base::CommandLine cmd_line = base::CommandLine(test_file_path);
+
+#if defined(OS_WIN)
+  std::unique_ptr<base::SharedMemory> field_trial_state(
+      new base::SharedMemory());
+  BrowserChildProcessHostImpl::CopyFeatureAndFieldTrialFlags(
+      &cmd_line, field_trial_state.get());
+  std::string field_trial_state_string(
+      static_cast<char*>(field_trial_state->memory()));
+
+  EXPECT_EQ("Trial1/Group1/", field_trial_state_string);
+  EXPECT_TRUE(cmd_line.HasSwitch(switches::kFieldTrialHandle));
+#else
+  BrowserChildProcessHostImpl::CopyFeatureAndFieldTrialFlags(&cmd_line,
+                                                             nullptr);
+  EXPECT_TRUE(cmd_line.HasSwitch(switches::kForceFieldTrials));
+#endif
+}

[Alexei Svitkine (slow), 2016/10/06 13:45:30]

Can this test now move to base/ ? Or is there still something in
browser_child_process_host_impl that needs to be tested?

[lawrencewu, 2016/10/06 20:14:57]

Done.

+
+}  // namespace content