Improve process launch handle sharing API.

base/test/launcher/test_launcher.h

Index: base/test/launcher/test_launcher.h
diff --git a/base/test/launcher/test_launcher.h b/base/test/launcher/test_launcher.h
index dd6984689c6d0d5fda4e3c16158ee83e4466b4cb..df2c9108bde6d0e674ade30a5e06dc634a944962 100644
--- a/base/test/launcher/test_launcher.h
+++ b/base/test/launcher/test_launcher.h
@@ -89,13 +89,18 @@ class TestLauncher {
   };
 
   struct LaunchOptions {
+    LaunchOptions();
+    LaunchOptions(const LaunchOptions& other);
+    ~LaunchOptions();
+
     int flags = 0;
-#if defined(OS_WIN)
     // These mirror values in base::LaunchOptions, see it for details.
-    HandlesToInheritVector* handles_to_inherit = nullptr;
-    bool inherit_handles = false;
+#if defined(OS_WIN)
+    base::LaunchOptions::InheritMode inherit_mode =
+        base::LaunchOptions::INHERIT_SPECIFIC;
+    std::vector<HANDLE> handles_to_inherit;
 #elif defined(OS_POSIX)
-    const FileHandleMappingVector* fds_to_remap = nullptr;
+    FileHandleMappingVector fds_to_remap;
 #endif
   };