Turn the utility process image decoder into a Mojo service.

services/image_decoder/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")
+
+source_set("image_decoder") {
+  sources = [
+    "image_decoder_impl.cc",
+    "image_decoder_impl.h",
+  ]
+
+  public_deps = [
+    "//base",
+    "//services/image_decoder/public/interfaces",
+    "//third_party/mojo/src/mojo/public/cpp/bindings",
+  ]
+
+  deps = [
+    "//content/public/child",
+    "//skia",
+    "//skia/public",
+  ]
+}
+
+test("image_decoder_unittests") {
+  sources = [
+    "image_decoder_impl_unittest.cc",
+  ]
+
+  deps = [
+    ":image_decoder",
+    "//base",
+    "//base/allocator",
+    "//skia",
+    "//services/test:run_all_unittests",
+    "//testing/gtest",
+  ]
+}