Reorganize ChannelMojo related flags.

content/public/common/mojo_channel_switches.cc

+// 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 "content/public/common/mojo_channel_switches.h"
+
+#include "base/command_line.h"
+#include "ipc/mojo/ipc_channel_mojo.h"
+#include "mojo/common/common_type_converters.h"
+
+namespace switches {
+
+// Replaces renderer-browser IPC channel with ChnanelMojo.
+// TODO(morrita): Now ChannelMojo for the renderer is on by default.
+// Remove this once the change sticks.
+const char kEnableRendererMojoChannel[] =
+    "enable-renderer-mojo-channel";
+
+// Disale ChannelMojo usage regardless of the platform or the process type.
+const char kDisableMojoChannel[] = "disable-mojo-channel";
+
+}  // namespace switches
+
+namespace content {
+
+bool ShouldUseMojoChannel() {
+  const base::CommandLine& command_line =
+      *base::CommandLine::ForCurrentProcess();
+
+  if (command_line.HasSwitch(switches::kDisableMojoChannel))
+    return false;
+  if (command_line.HasSwitch(switches::kEnableRendererMojoChannel))
+    return true;
+  return IPC::ChannelMojo::ShouldBeUsed();
+}
+
+}  // namespace content