GN: Tighten up test target visibility + refactorings

webrtc/call/BUILD.gn

Index: webrtc/call/BUILD.gn
diff --git a/webrtc/call/BUILD.gn b/webrtc/call/BUILD.gn
index b56b4a20f6d555f01ba2cd0508ba3b7914274a64..9cc3c186389f686f3d105a94fa1afb8a0839fa76 100644
--- a/webrtc/call/BUILD.gn
+++ b/webrtc/call/BUILD.gn
@@ -73,6 +73,13 @@ rtc_static_library("call") {
 if (rtc_include_tests) {
   rtc_source_set("call_tests") {
     testonly = true
+
+    # Skip restricting visibility on mobile platforms since the tests on those
+    # gets additional generated targets which would require many lines here to
+    # cover (which would be confusing to read and hard to maintain).
+    if (!is_android && !is_ios) {
+      visibility = [ "//webrtc:video_engine_tests" ]
+    }
     sources = [
       "bitrate_allocator_unittest.cc",
       "bitrate_estimator_tests.cc",
@@ -105,6 +112,13 @@ if (rtc_include_tests) {
 
   rtc_source_set("call_perf_tests") {
     testonly = true
+
+    # Skip restricting visibility on mobile platforms since the tests on those
+    # gets additional generated targets which would require many lines here to
+    # cover (which would be confusing to read and hard to maintain).
+    if (!is_android && !is_ios) {
+      visibility = [ "//webrtc:webrtc_perf_tests" ]
+    }
     sources = [
       "call_perf_tests.cc",
       "rampup_tests.cc",