Implement author-constructible ReadableStream using V8 extras

build/common.gypi

 # 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.
 
 # IMPORTANT:
 # Please don't directly include this file if you are building via gyp_chromium,
 # since gyp_chromium is automatically forcing its inclusion.
 {
   # Variables expected to be overriden on the GYP command line (-D) or by
   # ~/.gyp/include.gypi.
@@ skipping 1505 matching lines @@
     'v8_toolset_for_d8': 'host',
 
     # V8 extras
     # Adding V8 extras files requires API owners review
     # Be sure to synchronize with build/module_args/v8.gni
 
     'v8_extra_library_files': [
     ],
     'v8_experimental_extra_library_files': [
       '../third_party/WebKit/Source/core/streams/ByteLengthQueuingStrategy.js',
+      '../third_party/WebKit/Source/core/streams/CountQueuingStrategy.js',
+      '../third_party/WebKit/Source/core/streams/ReadableStream.js',
     ],
 
     # Use brlapi from brltty for braille display support.
     'use_brlapi%': 0,
 
     # Relative path to icu.gyp from this file.
     'icu_gyp_path': '../third_party/icu/icu.gyp',
 
     # IPC fuzzer is disabled by default.
     'enable_ipc_fuzzer%': 0,
@@ skipping 4761 matching lines @@
     # settings in target dicts.  SYMROOT is a special case, because many other
     # Xcode variables depend on it, including variables such as
     # PROJECT_DERIVED_FILE_DIR.  When a source group corresponding to something
     # like PROJECT_DERIVED_FILE_DIR is added to a project, in order for the
     # files to appear (when present) in the UI as actual files and not red
     # red "missing file" proxies, the correct path to PROJECT_DERIVED_FILE_DIR,
     # and therefore SYMROOT, needs to be set at the project level.
     'SYMROOT': '<(DEPTH)/xcodebuild',
   },
 }