Move and rename CmaMessageLoop to chromecast/media/base/MediaMessageLoop

chromecast/media/base/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("//build/config/crypto.gni")
 import("//chromecast/chromecast.gni")
 
 source_set("base") {
   sources = [
     "decrypt_context.cc",
     "decrypt_context.h",
     "decrypt_context_clearkey.cc",
     "decrypt_context_clearkey.h",
     "key_systems_common.cc",
     "key_systems_common.h",
     "media_caps.cc",
     "media_caps.h",
+    "media_message_loop.cc",
+    "media_message_loop.h",
     "switching_media_renderer.cc",
     "switching_media_renderer.h",
   ]
 
   deps = [
     "//base",
     "//crypto",
     "//crypto:platform",
     "//third_party/widevine/cdm:version_h",
   ]
 
   configs += [ "//chromecast:config" ]
 
   if (is_chromecast_chrome_branded) {
     deps += [
       # TODO(gyp): add dependency on internal/chromecast_internal:media_base_internal
     ]
   } else {
     sources += [ "key_systems_common_simple.cc" ]
   }
 }