[mojo-edk] Initialize message buffers after alloc

mojo/edk/system/channel.cc

Index: mojo/edk/system/channel.cc
diff --git a/mojo/edk/system/channel.cc b/mojo/edk/system/channel.cc
index fd6370d2c89bc9cc9323b323f57c0c9684d297a2..ab138b97c3c54005204a879b59c3b87051d66a4f 100644
--- a/mojo/edk/system/channel.cc
+++ b/mojo/edk/system/channel.cc
@@ -36,6 +36,7 @@ Channel::Message::Message(size_t payload_size, size_t num_handles) {
 
   data_ = static_cast<char*>(base::AlignedAlloc(size_,
                                                 kChannelMessageAlignment));
+  memset(data_, 0, size_);
   header_ = reinterpret_cast<Header*>(data_);
 
   DCHECK_LE(size_, std::numeric_limits<uint32_t>::max());