Improve process launch handle sharing API.

base/test/launcher/test_launcher.cc

Index: base/test/launcher/test_launcher.cc
diff --git a/base/test/launcher/test_launcher.cc b/base/test/launcher/test_launcher.cc
index a9bf16daa744b31e241cc48fb3d632bf3aad10be..591151ea8ff1278841a961d0d1dde774134e55d5 100644
--- a/base/test/launcher/test_launcher.cc
+++ b/base/test/launcher/test_launcher.cc
@@ -392,6 +392,9 @@ void DoLaunchChildTestProcess(
 
   LaunchOptions options;
 #if defined(OS_WIN)
+  options.inherit_mode = test_launch_options.inherit_mode;
+  options.handles_to_inherit = test_launch_options.handles_to_inherit;
+
   win::ScopedHandle handle;
 
   if (redirect_stdio) {
@@ -399,21 +402,14 @@ void DoLaunchChildTestProcess(
                           FILE_SHARE_READ | FILE_SHARE_DELETE, nullptr,
                           OPEN_EXISTING, FILE_ATTRIBUTE_TEMPORARY, NULL));
     CHECK(handle.IsValid());
-    options.inherit_handles = true;
     options.stdin_handle = INVALID_HANDLE_VALUE;
     options.stdout_handle = handle.Get();
     options.stderr_handle = handle.Get();
-  }
-
-  if (test_launch_options.inherit_handles) {
-    if (!options.inherit_handles) {
-      options.inherit_handles = true;
-      options.stdin_handle = nullptr;
-      options.stdout_handle = nullptr;
-      options.stderr_handle = nullptr;
-    }
-    DCHECK(!options.handles_to_inherit);
-    options.handles_to_inherit = test_launch_options.handles_to_inherit;
+    // See LaunchOptions.stdout_handle comments for why this compares against
+    // FILE_TYPE_CHAR.
+    if (options.inherit_mode == base::LaunchOptions::Inherit::kSpecific &&
+        GetFileType(handle.Get()) != FILE_TYPE_CHAR)
+      options.handles_to_inherit.push_back(handle.Get());
   }
 
 #elif defined(OS_POSIX)
@@ -422,22 +418,17 @@ void DoLaunchChildTestProcess(
   options.kill_on_parent_death = true;
 #endif  // defined(OS_LINUX)
 
-  FileHandleMappingVector fds_mapping;
   ScopedFD output_file_fd;
 
+  options.fds_to_remap = test_launch_options.fds_to_remap;
   if (redirect_stdio) {
     output_file_fd.reset(open(output_file.value().c_str(), O_RDWR));
     CHECK(output_file_fd.is_valid());
 
-    fds_mapping.push_back(std::make_pair(output_file_fd.get(), STDOUT_FILENO));
-    fds_mapping.push_back(std::make_pair(output_file_fd.get(), STDERR_FILENO));
-    options.fds_to_remap = &fds_mapping;
-  }
-  if (test_launch_options.fds_to_remap) {
-    fds_mapping.insert(fds_mapping.end(),
-                       test_launch_options.fds_to_remap->begin(),
-                       test_launch_options.fds_to_remap->end());
-    options.fds_to_remap = &fds_mapping;
+    options.fds_to_remap.push_back(
+        std::make_pair(output_file_fd.get(), STDOUT_FILENO));
+    options.fds_to_remap.push_back(
+        std::make_pair(output_file_fd.get(), STDERR_FILENO));
   }
 #endif
 
@@ -484,6 +475,11 @@ const char kGTestOutputFlag[] = "gtest_output";
 
 TestLauncherDelegate::~TestLauncherDelegate() {}
 
+TestLauncher::LaunchOptions::LaunchOptions() = default;
+TestLauncher::LaunchOptions::LaunchOptions(const LaunchOptions& other) =
+    default;
+TestLauncher::LaunchOptions::~LaunchOptions() = default;
+
 TestLauncher::TestLauncher(TestLauncherDelegate* launcher_delegate,
                            size_t parallel_jobs)
     : launcher_delegate_(launcher_delegate),