Allow d.a.c to serve webm and mp4

Change-Id: I8c127642ee8bbeb5eda2cae0aaf2d0e902492a7a
diff --git a/scripts/app_engine_server/memcache_zipserve.py b/scripts/app_engine_server/memcache_zipserve.py
index bda33c0..15cbb1e 100644
--- a/scripts/app_engine_server/memcache_zipserve.py
+++ b/scripts/app_engine_server/memcache_zipserve.py
@@ -341,6 +341,14 @@
       self.response.headers['Content-Type'] = 'image/svg+xml'
       self.SetCachingHeaders(mustRevalidate)
       self.response.out.write(resp_data)
+    elif name.endswith('.mp4'):
+      self.response.headers['Content-Type'] = 'video/mp4'
+      self.SetCachingHeaders(mustRevalidate)
+      self.response.out.write(resp_data)
+    elif name.endswith('.webm'):
+      self.response.headers['Content-Type'] = 'video/webm'
+      self.SetCachingHeaders(mustRevalidate)
+      self.response.out.write(resp_data)
     return True
 
   def GetFromStore(self, file_path):