Fix RTS filter file names

The current code uses the RTS action's target name, which is slightly
different from the actual file name we want to depend on -- the test
target name is the correct name.

Bug: 1190328
Change-Id: Ifdbc3c652b9dfabbe0b2c0a14439e4a069e233a7
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2815998
Auto-Submit: Gregory Guterman <guterman@google.com>
Commit-Queue: Gregory Guterman <guterman@google.com>
Commit-Queue: Dirk Pranke <dpranke@google.com>
Reviewed-by: Dirk Pranke <dpranke@google.com>
Cr-Commit-Position: refs/heads/master@{#870721}

diff --git a/testing/test.gni b/testing/test.gni
index 211f5a1..2950167 100644
--- a/testing/test.gni
+++ b/testing/test.gni

@@ -55,7 +55,7 @@
   if (use_rts) {
     action("${target_name}__rts_filters") {
       script = "//build/add_rts_filters.py"
-      rts_file = "${root_build_dir}/gen/rts/${target_name}.filter"
+      rts_file = "${root_build_dir}/gen/rts/${invoker.target_name}.filter"
       args = [ rebase_path(rts_file, root_build_dir) ]
       outputs = [ rts_file ]
     }
@@ -708,7 +708,7 @@
   if (use_rts) {
     action("${target_name}__rts_filters") {
       script = "//build/add_rts_filters.py"
-      rts_file = "${root_build_dir}/gen/rts/${target_name}.filter"
+      rts_file = "${root_build_dir}/gen/rts/${invoker.target_name}.filter"
       args = [ rebase_path(rts_file, root_build_dir) ]
       outputs = [ rts_file ]
     }