[Suggestions] Create ImageEncoder, to abstract away image encode/decode.

components/suggestions/BUILD.gn

Index: components/suggestions/BUILD.gn
diff --git a/components/suggestions/BUILD.gn b/components/suggestions/BUILD.gn
index 12c9576a2a2154be96a3d617ab260627623737b6..c77a5eef6a72819a3115cae73dae3e95dcb8b391 100644
--- a/components/suggestions/BUILD.gn
+++ b/components/suggestions/BUILD.gn
@@ -6,6 +6,7 @@ static_library("suggestions") {
   sources = [
     "blacklist_store.cc",
     "blacklist_store.h",
+    "image_encoder.h",
     "image_fetcher.h",
     "image_fetcher_delegate.h",
     "image_manager.cc",
@@ -27,7 +28,18 @@ static_library("suggestions") {
     "//components/suggestions/proto",
     "//components/variations",
     "//net",
-    "//ui/gfx",
     "//url",
   ]
 }
+
+static_library("jpeg_image_encoder") {
+  sources = [
+    "jpeg_image_encoder.cc",
+    "jpeg_image_encoder.h",
+  ]
+
+  deps = [
+    "//base",
+    "//ui/gfx",
+  ]
+}