Move MediaController.java upstream to Chromium repository.

third_party/android_media/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/android/rules.gni")
+
+assert(is_android)
+
+android_resources("android_media_resources") {
+  custom_package = "org.chromium.third_party.android.media"
+  resource_dirs = [ "java/res" ]
+  deps = [
+    "//third_party/android_tools:android_support_v7_appcompat_resources",
+    "//third_party/android_tools:android_support_v7_mediarouter_resources",
+  ]
+}
+
+android_library("android_media_java") {
+  DEPRECATED_java_in_dir = "java/src"
+  deps = [
+    ":android_media_resources",
+    "//third_party/android_tools:android_support_v7_mediarouter_java",
+    "//third_party/android_tools:android_support_v7_mediarouter_resources",
+    "//third_party/android_tools:android_support_v7_appcompat_java",
+    "//third_party/android_tools:android_support_v13_java",
+  ]
+}