Refactor image handling in Sky

sky/engine/core/core.gni

Index: sky/engine/core/core.gni
diff --git a/sky/engine/core/core.gni b/sky/engine/core/core.gni
index 536494015d263b94a2a18b9ec3f85f86b62a5793..43ee00e24389585220a36e3800e2a51460952934 100644
--- a/sky/engine/core/core.gni
+++ b/sky/engine/core/core.gni
@@ -798,6 +798,8 @@ sky_core_files = [
   "inspector/ScriptAsyncCallStack.h",
   "inspector/ScriptGCEventListener.h",
   "layout/LayoutCallback.h",
+  "loader/CanvasImageLoader.cpp",
+  "loader/CanvasImageLoader.h",
   "loader/DocumentLoadTiming.cpp",
   "loader/DocumentLoadTiming.h",
   "loader/EmptyClients.cpp",
@@ -810,11 +812,10 @@ sky_core_files = [
   "loader/FrameLoaderTypes.h",
   "loader/ImageLoader.cpp",
   "loader/ImageLoader.h",
+  "loader/ImageLoaderCallback.h",
   "loader/MojoLoader.cpp",
   "loader/MojoLoader.h",
   "loader/NavigationPolicy.h",
-  "loader/NewImageLoader.cpp",
-  "loader/NewImageLoader.h",
   "loader/UniqueIdentifier.cpp",
   "loader/UniqueIdentifier.h",
   "page/ChromeClient.h",
@@ -1127,6 +1128,8 @@ core_idl_files = get_path_info([
                                  "html/TextMetrics.idl",
                                  "html/VoidCallback.idl",
                                  "layout/LayoutCallback.idl",
+                                 "loader/ImageLoader.idl",
+                                 "loader/ImageLoaderCallback.idl",
                                  "painting/Canvas.idl",
                                  "painting/ColorFilter.idl",
                                  "painting/DrawLooper.idl",