Add support for computing iOS code coverage

Also disable failing PosixSignalDeliveryTest* tests for iOS

Bug: chromium:844647
Change-Id: I64bb233bef2f06f6778f2d475b6d3ad685fb9143
Reviewed-on: https://webrtc-review.googlesource.com/c/105641
Reviewed-by: Henrik Andreassson <henrika@webrtc.org>
Reviewed-by: Patrik Höglund <phoglund@webrtc.org>
Reviewed-by: Peter Hanspers <peterhanspers@webrtc.org>
Reviewed-by: Artem Titarenko <artit@webrtc.org>
Commit-Queue: Artem Titarenko <artit@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#25524}
diff --git a/examples/BUILD.gn b/examples/BUILD.gn
index cd931b4..d136e96 100644
--- a/examples/BUILD.gn
+++ b/examples/BUILD.gn
@@ -648,12 +648,13 @@
       rtc_ios_xctest_test("apprtcmobile_tests") {
         info_plist = "objc/AppRTCMobile/ios/Info.plist"
         sources = [
-          "objc/AppRTCMobile/ios/main.m",
+          "objc/AppRTCMobile/tests/main.mm",
         ]
         deps = [
           ":AppRTCMobile_lib",
           ":apprtcmobile_test_sources",
           "../sdk:framework_objc",
+          "//test:test_support",
         ]
         ldflags = [ "-all_load" ]
       }
diff --git a/examples/objc/AppRTCMobile/tests/main.mm b/examples/objc/AppRTCMobile/tests/main.mm
new file mode 100644
index 0000000..3625ffd
--- /dev/null
+++ b/examples/objc/AppRTCMobile/tests/main.mm
@@ -0,0 +1,21 @@
+/*
+ *  Copyright 2018 The WebRTC Project Authors. All rights reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#import <UIKit/UIKit.h>
+
+#include "test/ios/coverage_util_ios.h"
+
+int main(int argc, char* argv[]) {
+  rtc::test::ConfigureCoverageReportPath();
+
+  @autoreleasepool {
+    return UIApplicationMain(argc, argv, nil, nil);
+  }
+}