diff --git a/common/subprocess_unittest.cc b/common/subprocess_unittest.cc
index 104ef41..bc52b83 100644
--- a/common/subprocess_unittest.cc
+++ b/common/subprocess_unittest.cc
@@ -45,6 +45,7 @@
 using base::TimeDelta;
 using brillo::MessageLoop;
 using std::string;
+using std::unique_ptr;
 using std::vector;
 
 namespace {
@@ -73,6 +74,10 @@
   brillo::BaseMessageLoop loop_{&base_loop_};
   brillo::AsynchronousSignalHandler async_signal_handler_;
   Subprocess subprocess_;
+#ifndef __ANDROID__
+  unique_ptr<base::FileDescriptorWatcher::Controller> watcher_;
+#endif  // __ANDROID__
+
 };
 
 namespace {
@@ -193,7 +198,7 @@
 TEST_F(SubprocessTest, SynchronousTrueSearchsOnPath) {
   int rc = -1;
   EXPECT_TRUE(Subprocess::SynchronousExecFlags(
-      {"true"}, Subprocess::kSearchPath, &rc, nullptr));
+      {"true"}, Subprocess::kSearchPath, &rc, nullptr, nullptr));
   EXPECT_EQ(0, rc);
 }
 
@@ -201,16 +206,17 @@
   vector<string> cmd = {
       kBinPath "/sh", "-c", "echo -n stdout-here; echo -n stderr-there >&2"};
   int rc = -1;
-  string stdout;
-  ASSERT_TRUE(Subprocess::SynchronousExec(cmd, &rc, &stdout));
+  string stdout, stderr;
+  ASSERT_TRUE(Subprocess::SynchronousExec(cmd, &rc, &stdout, &stderr));
   EXPECT_EQ(0, rc);
-  EXPECT_EQ("stdout-herestderr-there", stdout);
+  EXPECT_EQ("stdout-here", stdout);
+  EXPECT_EQ("stderr-there", stderr);
 }
 
 TEST_F(SubprocessTest, SynchronousEchoNoOutputTest) {
   int rc = -1;
   ASSERT_TRUE(Subprocess::SynchronousExec(
-      {kBinPath "/sh", "-c", "echo test"}, &rc, nullptr));
+      {kBinPath "/sh", "-c", "echo test"}, &rc, nullptr, nullptr));
   EXPECT_EQ(0, rc);
 }
 
@@ -255,6 +261,7 @@
   int fifo_fd = HANDLE_EINTR(open(fifo_path.c_str(), O_RDONLY));
   EXPECT_GE(fifo_fd, 0);
 
+#ifdef __ANDROID__
   loop_.WatchFileDescriptor(FROM_HERE,
                             fifo_fd,
                             MessageLoop::WatchMode::kWatchRead,
@@ -270,6 +277,25 @@
                                 },
                                 fifo_fd,
                                 tag));
+#else
+  watcher_ = base::FileDescriptorWatcher::WatchReadable(
+      fifo_fd,
+      base::Bind(
+          [](unique_ptr<base::FileDescriptorWatcher::Controller>* watcher,
+             int fifo_fd,
+             uint32_t tag) {
+            char c;
+            EXPECT_EQ(1, HANDLE_EINTR(read(fifo_fd, &c, 1)));
+            EXPECT_EQ('X', c);
+            LOG(INFO) << "Killing tag " << tag;
+            Subprocess::Get().KillExec(tag);
+            *watcher = nullptr;
+          },
+          // watcher_ is no longer used outside the clousure.
+          base::Unretained(&watcher_),
+          fifo_fd,
+          tag));
+#endif  // __ANDROID__
 
   // This test would leak a callback that runs when the child process exits
   // unless we wait for it to run.