[NaCl SDK] nacl_io: Add flow control the JavaScript pipes.

native_client_sdk/src/tests/nacl_io_test/event_test.cc

Index: native_client_sdk/src/tests/nacl_io_test/event_test.cc
diff --git a/native_client_sdk/src/tests/nacl_io_test/event_test.cc b/native_client_sdk/src/tests/nacl_io_test/event_test.cc
index 8ca754da4808841c0466532e87f8c62ba041ff30..fefeb1a9a6805e2d76f1af3e36c9ff04f8f2a497 100644
--- a/native_client_sdk/src/tests/nacl_io_test/event_test.cc
+++ b/native_client_sdk/src/tests/nacl_io_test/event_test.cc
@@ -174,14 +174,18 @@ TEST(PipeTest, Listener) {
   {
     EventListenerLock locker(&pipe);
     EXPECT_EQ(0, locker.WaitOnEvent(POLLOUT, 0));
-    EXPECT_EQ(sizeof(hello), pipe.Write_Locked(hello, sizeof(hello)));
+    int out_bytes = 0;
+    EXPECT_EQ(0, pipe.Write_Locked(hello, sizeof(hello), &out_bytes));
+    EXPECT_EQ(sizeof(hello), out_bytes);
   }
 
   // We should now be able to poll
   {
     EventListenerLock locker(&pipe);
     EXPECT_EQ(0, locker.WaitOnEvent(POLLIN, 0));
-    EXPECT_EQ(sizeof(hello), pipe.Read_Locked(tmp, sizeof(tmp)));
+    int out_bytes = -1;
+    EXPECT_EQ(0, pipe.Read_Locked(tmp, sizeof(tmp), &out_bytes));
+    EXPECT_EQ(sizeof(hello), out_bytes);
   }
 
   // Verify we can read it correctly.