Add a Mojo EDK for Chrome that uses one OS pipe per message pipe.

mojo/edk/system/master_impl.cc

Index: mojo/edk/system/master_impl.cc
diff --git a/mojo/edk/system/master_impl.cc b/mojo/edk/system/master_impl.cc
new file mode 100644
index 0000000000000000000000000000000000000000..13b76f2a1fab5aa5d63b2afc0b386430a8ce53bb
--- /dev/null
+++ b/mojo/edk/system/master_impl.cc
@@ -0,0 +1,107 @@
+// Copyright 2015 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "mojo/edk/system/master_impl.h"
+
+#include "base/containers/hash_tables.h"
+#include "base/lazy_instance.h"
+#include "base/logging.h"
+#include "base/rand_util.h"
+#include "mojo/edk/embedder/embedder.h"
+
+#if defined(OS_WIN)
+base::LazyInstance<base::hash_map<uint64_t, HANDLE>>::Leaky
+    g_token_map = LAZY_INSTANCE_INITIALIZER;
+#endif
+
+namespace mojo {
+namespace edk {
+
+MasterImpl::MasterImpl(base::ProcessId slave_pid)
+#if defined(OS_WIN)
+    : slave_process_(
+          base::Process::OpenWithAccess(slave_pid, PROCESS_DUP_HANDLE))
+#endif
+      {
+#if defined(OS_WIN)
+  DCHECK(slave_process_.IsValid());
+#endif
+}
+
+MasterImpl::~MasterImpl() {
+}
+
+void MasterImpl::HandleToToken(ScopedHandle platform_handle,
+                               const HandleToTokenCallback& callback) {
+#if defined(OS_WIN)
+  ScopedPlatformHandle sender_handle;
+  MojoResult unwrap_result = PassWrappedPlatformHandle(
+      platform_handle.get().value(), &sender_handle);
+  if (unwrap_result != MOJO_RESULT_OK) {
+    DLOG(WARNING) << "HandleToToken couldn't unwrap platform handle.";
+    callback.Run(unwrap_result, 0);
+    return;
+  }
+
+  HANDLE master_handle = NULL;
+  BOOL dup_result =
+      DuplicateHandle(slave_process_.Handle(), sender_handle.release().handle,
+                      base::GetCurrentProcessHandle(), &master_handle, 0,
+                      FALSE, DUPLICATE_SAME_ACCESS | DUPLICATE_CLOSE_SOURCE);
+  if (!dup_result) {
+    DLOG(WARNING) << "HandleToToken couldn't duplicate slave handle.";
+    callback.Run(MOJO_RESULT_INVALID_ARGUMENT, 0);
+    return;
+  }
+
+  uint64_t token = base::RandUint64();
+  g_token_map.Get()[token] = master_handle;
+  callback.Run(MOJO_RESULT_OK, token);
+#else
+  NOTREACHED();
+#endif
+}
+
+void MasterImpl::TokenToHandle(uint64_t token,
+                               const TokenToHandleCallback& callback) {
+#if defined(OS_WIN)
+  auto it = g_token_map.Get().find(token);
+  if (it == g_token_map.Get().end()) {
+    DLOG(WARNING) << "TokenToHandle didn't find token.";
+    callback.Run(MOJO_RESULT_INVALID_ARGUMENT, ScopedHandle());
+    return;
+  }
+
+  HANDLE slave_handle = NULL;
+  BOOL dup_result =
+      DuplicateHandle(base::GetCurrentProcessHandle(), it->second,
+                      slave_process_.Handle(), &slave_handle, 0,
+                      FALSE, DUPLICATE_SAME_ACCESS | DUPLICATE_CLOSE_SOURCE);
+  if (!dup_result) {
+    DLOG(WARNING) << "TokenToHandle couldn't duplicate slave handle.";
+    callback.Run(MOJO_RESULT_INTERNAL, ScopedHandle());
+    return;
+  }
+
+  ScopedPlatformHandle platform_handle;
+  platform_handle.reset(PlatformHandle(slave_handle));
+
+  MojoHandle handle;
+  MojoResult wrap_result = CreatePlatformHandleWrapper(
+      platform_handle.Pass(), &handle);
+  if (wrap_result != MOJO_RESULT_OK) {
+    DLOG(WARNING) << "TokenToHandle couldn't unwrap platform handle.";
+    callback.Run(wrap_result, ScopedHandle());
+    return;
+  }
+
+  callback.Run(MOJO_RESULT_OK, ScopedHandle(Handle(handle)));
+  g_token_map.Get().erase(it);
+#else
+  NOTREACHED();
+#endif
+}
+
+}  // namespace edk
+}  // namespace mojo