Support for "Do not blend" in mux and demux libraries

Change-Id: I9566a8e2d059fe1ebd9ca99c7e13311bf3f8f281
diff --git a/examples/webpmux.c b/examples/webpmux.c
index bccd5c6..e8afe3a 100644
--- a/examples/webpmux.c
+++ b/examples/webpmux.c
@@ -430,6 +430,8 @@
   // Note: The sanity of the following conversion is checked by
   // WebPMuxSetAnimationParams().
   info->dispose_method = (WebPMuxAnimDispose)dispose_method;
+  // TODO(urvang): Add support for parsing blending method too.
+  info->blend_method = WEBP_MUX_BLEND;
   return 1;
 }