Use a qualified path to blink resources, content part.

build/secondary/tools/grit/grit_rule.gni

Index: build/secondary/tools/grit/grit_rule.gni
diff --git a/build/secondary/tools/grit/grit_rule.gni b/build/secondary/tools/grit/grit_rule.gni
index 3abbdb86f4724231ddc20f7b565eb473f7e01c6b..d7a8860a8e2e650616506500f714a39e2b1c7819 100644
--- a/build/secondary/tools/grit/grit_rule.gni
+++ b/build/secondary/tools/grit/grit_rule.gni
@@ -41,6 +41,9 @@
 #   output_dir (optional)
 #     Directory for generated files.
 #
+#   use_qualified_include (optional)
+#     If set, output_dir is not added to include_dirs.
+#
 #   deps  (optional)
 #   visibility  (optional)
 #       Normal meaning.
@@ -247,7 +250,10 @@ template("grit") {
   # (like "mycomponent/foo.h"). This config sets up the include path.
   grit_config = target_name + "_grit_config"
   config(grit_config) {
-    include_dirs = [ output_dir ]
+    if (!defined(invoker.use_qualified_include) ||
+        !invoker.use_qualified_include) {
+      include_dirs = [ output_dir ]
+    }
     visibility = target_visibility
   }