Update lottie-ios

submodules/lottie-ios/Sources/Public/ImageProvider/AnimationImageProvider.swift

@@ -0,0 +1,21 @@
+//
+//  LottieImageProvider.swift
+//  lottie-swift
+//
+//  Created by Brandon Withrow on 1/25/19.
+//
+
+import CoreGraphics
+import Foundation
+
+/// Image provider is a protocol that is used to supply images to `AnimationView`.
+///
+/// Some animations require a reference to an image. The image provider loads and
+/// provides those images to the `AnimationView`.  Lottie includes a couple of
+/// prebuilt Image Providers that supply images from a Bundle, or from a FilePath.
+///
+/// Additionally custom Image Providers can be made to load images from a URL,
+/// or to Cache images.
+public protocol AnimationImageProvider {
+  func imageForAsset(asset: ImageAsset) -> CGImage?
+}