Fix C++ tests to enable running on android

test/cpp/client/BUILD

@@ -37,7 +37,10 @@ grpc_cc_test(
     srcs = ["client_channel_stress_test.cc"],
     # TODO(jtattermusch): test fails frequently on Win RBE, but passes locally
     # reenable the tests once it works reliably on Win RBE.
-    tags = ["no_windows"],
+    tags = [
+        "no_test_android",  # fails on android due to "Too many open files".
+        "no_windows",
+    ],
     deps = [
         "//:gpr",
         "//:grpc",

test/cpp/common/time_jump_test.cc

@@ -36,6 +36,10 @@
 
 extern char** environ;
 
+#ifdef GPR_ANDROID
+// Android doesn't have posix_spawn. Use std::system instead
+void run_cmd(const char* cmd) { std::system(cmd); }
+#else
 void run_cmd(const char* cmd) {
   pid_t pid;
   const char* argv[] = {const_cast<const char*>("sh"),
@@ -50,6 +54,7 @@ void run_cmd(const char* cmd) {
     }
   }
 }
+#endif
 
 class TimeJumpTest : public ::testing::TestWithParam<std::string> {
  protected:

test/cpp/end2end/BUILD

@@ -91,6 +91,7 @@ grpc_cc_test(
         "gtest",
     ],
     tags = [
+        "no_test_android",  # android_cc_test doesn't work with data dependency.
         "no_test_ios",
         "no_windows",
     ],
@@ -116,6 +117,7 @@ grpc_cc_test(
         "gtest",
     ],
     tags = [
+        "no_test_android",  # android_cc_test doesn't work with data dependency.
         "no_test_ios",
         "no_windows",
     ],
@@ -571,6 +573,7 @@ grpc_cc_test(
         "gtest",
     ],
     tags = [
+        "no_test_android",  # android_cc_test doesn't work with data dependency.
         "no_test_ios",
         "no_windows",
     ],
@@ -730,6 +733,7 @@ grpc_cc_test(
     ],
     tags = [
         "manual",
+        "no_test_android",
         "no_test_ios",
     ],  # test requires root, won't work with bazel RBE
     deps = [

test/cpp/end2end/xds_end2end_test.cc

@@ -764,13 +764,14 @@ class XdsEnd2endTest : public ::testing::TestWithParam<TestType> {
   }
 
   void WaitForBackend(size_t backend_idx, bool reset_counters = true) {
-    gpr_log(GPR_INFO,
+    gpr_log(GPR_INFO, "========= WAITING FOR BACKEND %lu ==========",
-            "========= WAITING FOR BACKEND %lu ==========", backend_idx);
+            static_cast<unsigned long>(backend_idx));
     do {
       (void)SendRpc();
     } while (backends_[backend_idx]->backend_service()->request_count() == 0);
     if (reset_counters) ResetBackendCounters();
-    gpr_log(GPR_INFO, "========= BACKEND %lu READY ==========", backend_idx);
+    gpr_log(GPR_INFO, "========= BACKEND %lu READY ==========",
+            static_cast<unsigned long>(backend_idx));
   }
 
   grpc_core::ServerAddressList CreateAddressListFromPortList(