[NaCl SDK] Make the SDK examples buildable as a packaged app.

native_client_sdk/src/libraries/nacl_io/mount_http.cc

 /* Copyright (c) 2012 The Chromium Authors. All rights reserved.
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "nacl_io/mount_http.h"
 #include <assert.h>
 #include <ctype.h>
 #include <errno.h>
 #include <fcntl.h>
@@ skipping 215 matching lines @@
       // errno is already set by OpenUrl.
       return -1;
     }
 
     ScopedResource scoped_loader(mount_->ppapi(), loader);
     ScopedResource scoped_request(mount_->ppapi(), request);
     ScopedResource scoped_response(mount_->ppapi(), response);
 
 
     size_t entity_length;
-    if (ParseContentLength(response_headers, &entity_length))
+    if (ParseContentLength(response_headers, &entity_length)) {
       SetCachedSize(static_cast<off_t>(entity_length));
-    else
+    } else if (cache_content_ && !has_cached_size_) {
+      DownloadToCache();
+    } else {
       // Don't use SetCachedSize here -- it is actually unknown.
       stat_.st_size = 0;
+    }
 
     stat_.st_atime = 0; // TODO(binji): Use "Last-Modified".
     stat_.st_mtime = 0;
     stat_.st_ctime = 0;
   }
 
   // Fill the stat structure if provided
   if (stat) {
     memcpy(stat, &stat_, sizeof(stat_));
   }
@@ skipping 540 matching lines @@
     off_t len = manifest_node->Read(0, text, manifest_node->GetSize());
     manifest_node->Release();
 
     text[len] = 0;
     return text;
   }
 
   fprintf(stderr, "Could not open manifest: %s\n", manifest_name.c_str());
   return NULL;
 }