Convert SetIsIncognitoProcess to use mojo.

chrome/common/renderer.mojom

Index: chrome/common/renderer.mojom
diff --git a/chrome/common/renderer.mojom b/chrome/common/renderer.mojom
new file mode 100644
index 0000000000000000000000000000000000000000..c0e7ebc8d0d5a7f7a586f27471e379a1772cce4b
--- /dev/null
+++ b/chrome/common/renderer.mojom
@@ -0,0 +1,24 @@
+// Copyright 2016 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.
+
+module chrome.mojom;
+
+struct InitialConfigurationParams {
+  // Indicates whether this process is running in incognito mode.
+  bool is_incognito_process;
+
+  // TODO(nigeltao): port the ChromeViewMsg_SetContentSettingRules legacy IPC
+  // message to use Mojo.
+};
+
+// The primordial Channel-associated interface implemented by a render process.
+// This should be used for implementing browser-to-renderer control messages
+// which need to retain FIFO with respect to legacy IPC messages.
+//
+// See also content.mojom.Renderer defined in content/common/renderer.mojom.
+interface Renderer {
+  // Configures the renderer, queued to send when the render process will
+  // launch.
+  InitialConfiguration(InitialConfigurationParams params);
+};