Implement ByteLengthQueuingStrategy

This implements the ByteLengthQueuingStrategy class, using experimental V8
extras (so that it will only show up with experimental web platform features
enabled). It is a very simple initial step toward implementing ReadableStream
using the same mechanisms.

BUG=503491
R=yhirano@chromium.org,tyoshino@chromium.org,jochen@chromium.org

Review URL: https://codereview.chromium.org/1378213002

Cr-Original-Commit-Position: refs/heads/master@{#352951}
Cr-Mirrored-From: https://chromium.googlesource.com/chromium/src
Cr-Mirrored-Commit: f630fa0f19dec2f48f4cdd1fcc94488ebe6d3d9e

common.gypi

@@ -1515,6 +1515,16 @@
     # Compile d8 for the host toolset.
     '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',
+    ],
+
     # Use brlapi from brltty for braille display support.
     'use_brlapi%': 0,
 

module_args/v8.gni

@@ -11,5 +11,10 @@ enable_correct_v8_arch = false
 
 v8_use_external_startup_data = !(is_chromeos || 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 = []
+v8_experimental_extra_library_files =
+    [ "../third_party/WebKit/Source/core/streams/ByteLengthQueuingStrategy.js" ]