diff -r 000000000000 -r 6474c204b198 dom/asmjscache/PAsmJSCacheEntry.ipdl
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/dom/asmjscache/PAsmJSCacheEntry.ipdl	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,37 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+include protocol PContent;
+
+using mozilla::dom::asmjscache::Metadata from "mozilla/dom/asmjscache/AsmJSCache.h";
+
+namespace mozilla {
+namespace dom {
+namespace asmjscache {
+
+protocol PAsmJSCacheEntry
+{
+  manager PContent;
+
+  // When the cache is opened to read, the parent process sends over the
+  // origin's Metadata so the child process can select the cache entry to open
+  // (based on hash) and notify the parent (via SelectCacheFileToRead).
+child:
+  OnOpenMetadataForRead(Metadata metadata);
+parent:
+  SelectCacheFileToRead(uint32_t moduleIndex);
+  CacheMiss();
+
+child:
+  // Once the cache file has been opened, the child is notified and sent an
+  // open file descriptor.
+  OnOpenCacheFile(int64_t fileSize, FileDescriptor fileDesc);
+
+both:
+  __delete__();
+};
+
+} // namespace asmjscache
+} // namespace dom
+} // namespace mozilla