[project_settings] Generate devtools.json for DevTools-on-DevTools.

This generates project settings for DevTools-on-DevTools, using a v5
UUID with a pre-defined namespace, to ensure that builds remain
deterministic.

Fixed: 399502654
Bug: 395562934, 395037775
Change-Id: Ifa7c217eb9e5d0558b99c0e46085330bad9f8888
Doc: https://goo.gle/devtools-json-design
Reviewed-on: https://chromium-review.googlesource.com/c/devtools/devtools-frontend/+/6304926
Reviewed-by: Simon Zünd <[email protected]>
Commit-Queue: Benedikt Meurer <[email protected]>
Commit-Queue: Simon Zünd <[email protected]>
Auto-Submit: Benedikt Meurer <[email protected]>

Author: bmeurer

front_end/BUILD.gn

@@ -10,6 +10,7 @@ import("../scripts/build/typescript/typescript.gni")
 
 group("front_end") {
   public_deps = [
+    ":devtools_json",
     ":embedder-scripts",
     ":html_entrypoints",
     ":integration_test_runner",
@@ -49,6 +50,19 @@ group("integration_test_runner") {
   }
 }
 
+node_action("devtools_json") {
+  inputs = []
+
+  script = "scripts/build/generate_devtools_json.js"
+
+  args = [ rebase_path(
+          "$target_gen_dir/.well-known/appspecific/com.chrome.devtools.json",
+          root_build_dir) ]
+
+  outputs =
+      [ "$target_gen_dir/.well-known/appspecific/com.chrome.devtools.json" ]
+}
+
 node_action("html_entrypoints") {
   inputs = [ "entrypoint_template.html" ]