Implement author-constructible ReadableStream using V8 extras

build_overrides/v8.gni

 # 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.
 
 if (is_android) {
   import("//build/config/android/config.gni")
 }
 
 # TODO(sky): nuke this. Temporary while sorting out http://crbug.com/465456.
 enable_correct_v8_arch = false
 
 # TODO: Set v8_use_external_startup_data to true on Windows and iOS to match
 # GYP.
 # Windows - http://crbug.com/545641
 # iOS - http://crbug.com/545676
 v8_use_external_startup_data = !(is_win || is_ios)
 
 # V8 extras
 # Adding V8 extras files requires API owners review
 # Be sure to synchronize with build/common.gypi
 
-v8_extra_library_files = []
-v8_experimental_extra_library_files =
-    [ "../third_party/WebKit/Source/core/streams/ByteLengthQueuingStrategy.js" ]
+v8_extra_library_files =
+    [ "../third_party/WebKit/Source/core/streams/ReadableStreamTempStub.js" ]
+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",
+]
 
 if (is_android) {
   v8_external_startup_data_renaming_sources = [
     "$root_out_dir/natives_blob.bin",
     "$root_out_dir/snapshot_blob.bin",
   ]
   if (current_cpu == "arm" || current_cpu == "x86" || current_cpu == "mipsel") {
     v8_external_startup_data_renaming_destinations = [
       "natives_blob_32.bin",
       "snapshot_blob_32.bin",
     ]
   } else {
     v8_external_startup_data_renaming_destinations = [
       "natives_blob_64.bin",
       "snapshot_blob_64.bin",
     ]
   }
 }