Turn the utility process image decoder into a Mojo service.

components/image_decoder.gypi

Index: components/image_decoder.gypi
diff --git a/components/image_decoder.gypi b/components/image_decoder.gypi
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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.
+
+{
+  'targets': [
+    {
+      # GN version: //components/image_decoder/public/interfaces
+      'target_name': 'image_decoder_mojo_bindings',
+      'type': 'static_library',
+      'includes': [
+        '../third_party/mojo/mojom_bindings_generator.gypi',
+      ],
+      'dependencies': [
+        '../skia/skia.gyp:skia_mojo',
+      ],
+      'sources': [
+        'image_decoder/public/interfaces/image_decoder.mojom',
+      ],
+    },
+    {
+      # GN version: //components/image_decoder
+      'target_name': 'image_decoder',
+      'type': 'static_library',
+      'dependencies': [
+        '../base/base.gyp:base',
+        '../content/content.gyp:content_child',
+        '../skia/skia.gyp:skia',
+        '../skia/skia.gyp:skia_mojo',
+        '../third_party/mojo/mojo_public.gyp:mojo_cpp_bindings',
+        'image_decoder_mojo_bindings',
+      ],
+      'sources': [
+        'image_decoder/image_decoder_impl.cc',
+        'image_decoder/image_decoder_impl.h',
+      ],
+      'export_dependent_settings': [
+        'image_decoder_mojo_bindings',
+      ],
+    },
+  ],
+}