EDK: Add PlatformHandleWatcher to Channel (and ChannelManager) classes.

mojo/edk/system/remote_message_pipe_unittest.cc

Index: mojo/edk/system/remote_message_pipe_unittest.cc
diff --git a/mojo/edk/system/remote_message_pipe_unittest.cc b/mojo/edk/system/remote_message_pipe_unittest.cc
index 22495e30b11f164c03d672b8fb8c677dc29c4464..0963c352ea2b98a737b1a758d9b5bd15d77209c9 100644
--- a/mojo/edk/system/remote_message_pipe_unittest.cc
+++ b/mojo/edk/system/remote_message_pipe_unittest.cc
@@ -122,6 +122,8 @@ class RemoteMessagePipeTest : public testing::Test {
 
     channels_[channel_index] = MakeRefCounted<Channel>(&platform_support_);
     channels_[channel_index]->Init(
+        io_thread()->task_runner().Clone(),
+        io_thread()->platform_handle_watcher(),
         RawChannel::Create(platform_handles_[channel_index].Pass()));
   }