Recompile .rc files when manifests change in GN.

build/config/win/manifest.gni

Index: build/config/win/manifest.gni
diff --git a/build/config/win/manifest.gni b/build/config/win/manifest.gni
index 285cf258d776683a8f748aeced5ec8db0e98173c..3dcaddfb3bccd8369ddc1b044dac95ee3c5771b2 100644
--- a/build/config/win/manifest.gni
+++ b/build/config/win/manifest.gni
@@ -93,7 +93,10 @@ if (is_win) {
 
     # Make the final .manifest file.
     action(manifest_action_name) {
-      visibility = [ ":$source_set_name" ]
+      visibility = [
+        ":$source_set_name",
+        ":$rc_action_name",
+      ]
 
       script = "$root_build_dir/gyp-win-tool"
 
@@ -120,9 +123,7 @@ if (is_win) {
       forward_variables_from(invoker, [ "deps" ])
     }
 
-    # Make the .rc file that references the final manifest file. The manifest
-    # generation doesn't need to be a dependency because it's not actually
-    # needed until the .rc is compiled.
+    # Make the .rc file that references the final manifest file.
     #
     # This could easily be combined into one step, but this current separation
     # of .manifest and .rc matches GYP and allows us to re-use gyp-win-tool.
@@ -153,6 +154,14 @@ if (is_win) {
         rebase_path(rcfile, root_build_dir),
         manifest_resource_id,
       ]
+
+      # Although generating this file doesn't technically depend on the
+      # generated manifest, this dependency causes the .rc timestamp to be
+      # updated every time the manifest is updated. Otherwise, updating the
+      # manifest will not cause a recompilation of the .rc file.
+      deps = [
+        ":$manifest_action_name",
+      ]
     }
 
     # This source set only exists to compile and link the resource file.