increase timeout (#28480)

dev/integration_tests/ios_add2app/ios_add2appTests/IntegrationTests.m

diff --git a/dev/integration_tests/ios_add2app/ios_add2appTests/IntegrationTests.m b/dev/integration_tests/ios_add2app/ios_add2appTests/IntegrationTests.m
index cc988b2..677f5e9 100644
--- a/dev/integration_tests/ios_add2app/ios_add2appTests/IntegrationTests.m
+++ b/dev/integration_tests/ios_add2app/ios_add2appTests/IntegrationTests.m
@@ -11,7 +11,7 @@
 
 static void waitForInitialFlutterRender() {
   // TODO(dnfield,jamesderlin): actually sync with Flutter rendering.
-  CFRunLoopRunInMode(kCFRunLoopDefaultMode, 3, false);
+  CFRunLoopRunInMode(kCFRunLoopDefaultMode, 10, false);
 }
 
 @interface FlutterTests : XCTestCase