WIP: Browser image decoding using Mojo.

content/common/image_decoder.mojom

Index: content/common/image_decoder.mojom
diff --git a/content/common/image_decoder.mojom b/content/common/image_decoder.mojom
new file mode 100644
index 0000000000000000000000000000000000000000..e7f4f6d61213c230f32c9b842364003c99bf2b7e
--- /dev/null
+++ b/content/common/image_decoder.mojom
@@ -0,0 +1,31 @@
+module content;
+
+// These must match SkColorType
+//enum ColorType {
+//};
+
+// These must match SkAlphaType
+//enum AlphaType {
+//};
+
+struct ImageData {
+//  ColorType color_type;
+//  AlphaType alpha_type;
+  uint32 color_type;
+  uint32 alpha_type;
+
+  uint32 width;
+  uint32 height;
+
+  array<uint8> pixels;
+};
+
+interface ImageDecoder {
+  DecodeImage(array<uint8> encoded_data,
+              bool use_robust_jpeg,
+              bool shrink_to_fit)
+      => (bool success, ImageData? decoded_image);
+
+  DecodeImageBase64(string encoded_data)
+      => (bool success, ImageData? decoded_image);
+};