gn: start of format command

tools/gn/format_test_data/007.gn

Index: tools/gn/format_test_data/007.gn
diff --git a/tools/gn/format_test_data/007.gn b/tools/gn/format_test_data/007.gn
new file mode 100644
index 0000000000000000000000000000000000000000..3cd002d8606e2b8e250976cb1d911c28977a3ca4
--- /dev/null
+++ b/tools/gn/format_test_data/007.gn
@@ -0,0 +1,9 @@
+executable("test") {
+  sources = ["a.cc"]
+
+  # This is an unusual comment that's a header for the stuff that comes after
+  # it. We want to make sure that it's not connected to the next element in
+  # the file.
+
+  cflags = ["-Wee"]
+}