Blimp: create MessageDispatcher class.

blimp/common/BUILD.gn

 # 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.
 
+import("//testing/test.gni")
+
 component("blimp_common") {
   sources = [
     # TODO(dtrainor): Remove this once the LayerTreeHost settings for Blimp
     # are finalized or are pushed from the server component.  See
     # crbug.com/527655.
     "../../content/public/common/content_switches.cc",
     "blimp_common_export.h",
     "compositor/blimp_layer_tree_settings.cc",
     "compositor/blimp_layer_tree_settings.h",
   ]
 
   defines = [ "BLIMP_COMMON_IMPLEMENTATION=1" ]
 
   deps = [
     "//base",
     "//blimp/common/proto",
     "//cc",
     "//skia",
     "//ui/gfx/geometry",
     "//ui/gl",
     "//ui/native_theme",
   ]
 }