Turn the utility process image decoder into a Mojo service.

components/image_decoder/BUILD.gn

Index: components/image_decoder/BUILD.gn
diff --git a/components/image_decoder/BUILD.gn b/components/image_decoder/BUILD.gn
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index 0000000000000000000000000000000000000000..bff7647e87356dbf76167ee9950a3d728434e4ef
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+++ b/components/image_decoder/BUILD.gn
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+# 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",
+    "//components/image_decoder/public/interfaces",
+    "//third_party/mojo/src/mojo/public/cpp/bindings",
+  ]
+
+  deps = [
+    "//content/public/child",
+    "//mojo/environment:chromium",
+    "//skia",
+    "//skia/public",
+  ]
+}
+
+source_set("unit_tests") {
+  testonly = true
+  sources = [
+    "image_decoder_impl_unittest.cc",
+  ]
+
+  deps = [
+    ":image_decoder",
+    "//base",
+    "//base/allocator",
+    "//content/test:test_support",
+    "//skia",
+    "//testing/gtest",
+  ]
+}