Turn the utility process image decoder into a Mojo service.

skia/public/interfaces/bitmap.mojom

Index: skia/public/interfaces/bitmap.mojom
diff --git a/skia/public/interfaces/bitmap.mojom b/skia/public/interfaces/bitmap.mojom
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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.
+
+// This file contains structures used to represent SkBitmaps in Mojo.
+module skia;
+
+// Mirror of SkColorType.
+enum ColorType {
+  UNKNOWN,
+  ALPHA_8,
+  RGB_565,
+  ARGB_4444,
+  RGBA_8888,
+  BGRA_8888,
+  INDEX_8,
+  GRAY_8,
+};
+
+// Mirror of SkAlphaType.
+enum AlphaType {
+  UNKNOWN,
+  OPAQUE,
+  PREMUL,
+  UNPREMUL,
+};
+
+// Mirror of SkColorProfileType.
+enum ColorProfileType {
+  LINEAR,
+  SRGB,
+};
+
+struct Bitmap {
+  ColorType color_type;
+  AlphaType alpha_type;
+  ColorProfileType profile_type;
+
+  uint32 width;
+  uint32 height;
+
+  array<uint8> pixel_data;
+};