[NotForReview] Move GJDAH and GJDA to media/gpu/mojo

media/gpu/mojo/common/BUILD.gn

 # Copyright 2017 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("//mojo/public/tools/bindings/mojom.gni")
 
 mojom("jpeg_decoder") {
   sources = [
     "jpeg_decoder.mojom",
   ]
 
   deps = [
     "//media/mojo/interfaces",
     "//mojo/common:common_custom_types",
     "//ui/gfx/geometry/mojo",
   ]
 }