Use HTTP response headers for PNaCl caching instead of bitcode hash.

ppapi/native_client/src/trusted/plugin/pnacl_coordinator.h

 // 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.
 
 #ifndef NATIVE_CLIENT_SRC_TRUSTED_PLUGIN_PNACL_COORDINATOR_H_
 #define NATIVE_CLIENT_SRC_TRUSTED_PLUGIN_PNACL_COORDINATOR_H_
 
 #include <set>
 #include <map>
 #include <vector>
@@ skipping 152 matching lines @@
 
   // Callback for when llc and ld have been downloaded.
   void ResourcesDidLoad(int32_t pp_error);
 
   // Callbacks for temporary file related stages.
   // They are invoked from ResourcesDidLoad and proceed in declaration order.
   // Invoked when the temporary file system is successfully opened in PPAPI.
   void FileSystemDidOpen(int32_t pp_error);
   // Invoked after we are sure the PNaCl temporary directory exists.
   void DirectoryWasCreated(int32_t pp_error);
+  // Invoke to issue a GET request for bitcode.
+  void OpenBitcodeStream();
+  // Invoked when we've started an URL fetch for the pexe to check for
+  // caching metadata.
+  void BitcodeStreamDidOpen(int32_t pp_error);
   // Invoked after we have checked the PNaCl cache for a translated version.
   void CachedFileDidOpen(int32_t pp_error);
   // Invoked when a pexe data chunk arrives (when using streaming translation)
   void BitcodeStreamGotData(int32_t pp_error, FileStreamData data);
   // Invoked when a pexe data chunk is compiled.
   void BitcodeGotCompiled(int32_t pp_error, int64_t bytes_compiled);
   // Invoked when the pexe download finishes (using streaming translation)
   void BitcodeStreamDidFinish(int32_t pp_error);
   // Invoked when the write descriptor for obj_file_ is created.
   void ObjectFileDidOpen(int32_t pp_error);
@@ skipping 85 matching lines @@
   // The helper thread used to do translations via SRPC.
   // Keep this last in declaration order to ensure the other variables
   // haven't been destroyed yet when its destructor runs.
   nacl::scoped_ptr<PnaclTranslateThread> translate_thread_;
 };
 
 //----------------------------------------------------------------------
 
 }  // namespace plugin;
 #endif  // NATIVE_CLIENT_SRC_TRUSTED_PLUGIN_PNACL_COORDINATOR_H_