[test] Add an empty favicon.ico to reduce test flakiness.

Fixed: 356795124
Change-Id: I4ecdce51e0c7e3afce6579203052bb77b333a93e
Reviewed-on: https://chromium-review.googlesource.com/c/devtools/devtools-frontend/+/5766216
Auto-Submit: Benedikt Meurer <[email protected]>
Commit-Queue: Alex Rudenko <[email protected]>
Commit-Queue: Benedikt Meurer <[email protected]>
Reviewed-by: Alex Rudenko <[email protected]>
diff --git a/BUILD.gn b/BUILD.gn
index 0fda66b..2b3c999 100644
--- a/BUILD.gn
+++ b/BUILD.gn
@@ -5,6 +5,7 @@
 import("./config/gni/devtools_grd_files.gni")
 import("./config/gni/devtools_image_files.gni")
 import("./front_end/emulated_devices/optimized/optimized_images.gni")
+import("./scripts/build/ninja/copy.gni")
 import("./scripts/build/ninja/node.gni")
 import("./scripts/build/ninja/vars.gni")
 import("./third_party/blink/public/public_features.gni")
@@ -13,6 +14,7 @@
 #-------------------------------------------------------------------------------
 
 devtools_frontend_resources_deps = [
+  ":favicon",
   "front_end",
   "test",
 ]
@@ -199,3 +201,7 @@
   sourceslist = "$root_build_dir/indexer_ts_files.txt"
   public_deps = [ ":indexer_ts_files" ]
 }
+
+copy_to_gen("favicon") {
+  sources = [ "favicon.ico" ]
+}