Add a parser for messages with a Web Push Protocol-based payload

components/gcm_driver/crypto/BUILD.gn

 # Copyright 2015 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.
 
 import("//build/config/crypto.gni")
 
 static_library("crypto") {
   sources = [
     "encryption_header_parsers.cc",
     "encryption_header_parsers.h",
     "gcm_encryption_provider.cc",
     "gcm_encryption_provider.h",
     "gcm_key_store.cc",
     "gcm_key_store.h",
     "gcm_message_cryptographer.cc",
     "gcm_message_cryptographer.h",
+    "message_payload_parser.cc",
+    "message_payload_parser.h",
     "p256_key_util.cc",
     "p256_key_util.h",
   ]
 
   deps = [
     "//base",
     "//components/gcm_driver/common",
     "//components/gcm_driver/crypto/proto",
     "//components/leveldb_proto",
     "//crypto",
@@ skipping 18 matching lines @@
   ]
 }
 
 source_set("unit_tests") {
   testonly = true
   sources = [
     "encryption_header_parsers_unittest.cc",
     "gcm_encryption_provider_unittest.cc",
     "gcm_key_store_unittest.cc",
     "gcm_message_cryptographer_unittest.cc",
+    "message_payload_parser_unittest.cc",
     "p256_key_util_unittest.cc",
   ]
 
   deps = [
     ":crypto",
     "//base",
     "//base/test:test_support",
     "//components/gcm_driver/common",
     "//crypto",
     "//crypto:platform",
     "//net:test_support",
     "//testing/gtest",
     "//third_party/protobuf:protobuf_lite",
   ]
 }