Implement a MusBrowserFrame.

chrome/browser/BUILD.gn

 # Copyright 2014 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.
 
 import("//build/config/chrome_build.gni")
 import("//build/config/crypto.gni")
 import("//build/config/features.gni")
 import("//build/config/ui.gni")
 import("//media/media_options.gni")
 import("//third_party/protobuf/proto_library.gni")
@@ skipping 555 matching lines @@
   }
   if (use_aura) {
     sources +=
         rebase_path(gypi_values.chrome_browser_aura_sources, ".", "//chrome")
 
     # These files are only built in a GN build because they bring in
     # dependencies that don't build with GYP.
     sources += [
       "mojo_runner_state.cc",
       "mojo_runner_state.h",
+      "ui/views/frame/mus_browser_frame.cc",
+      "ui/views/frame/mus_browser_frame.h",
     ]
     deps += [
+      "//components/mus/public/interfaces",

[sky, 2015/11/06 17:07:46]

Seems like this will effect the size of the official builds. Should we only
include this if a compile time switch is set?

       "//mojo/runner/child:lib",
+      "//mojo/converters/network",
       "//ui/aura",
       "//ui/compositor",
       "//ui/keyboard",
       "//ui/keyboard:keyboard_with_content",
+      "//ui/views/mus",
     ]
     defines += [ "MOJO_RUNNER_CLIENT" ]
   }
   if (ui_compositor_image_transport) {
     deps += [ "//ui/gl" ]
   }
 
   if (use_ash) {
     sources +=
         rebase_path(gypi_values.chrome_browser_ash_sources, ".", "//chrome")
@@ skipping 661 matching lines @@
         rebase_path(gypi_values.chrome_browser_rlz_sources, ".", "//chrome")
     deps = [
       "//components/google/core/browser",
       "//components/omnibox/browser",
       "//components/rlz",
       "//components/search_engines",
       "//rlz:rlz_lib",
     ]
   }
 }