Add IMMEDIATE_CRASH to measure how much V8 APIs return empty MaybeLocal handles

third_party/WebKit/Source/bindings/core/v8/v8.gypi

 # Copyright 2014 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.
 
 {
     'includes': [
         'custom/custom.gypi',
         '../../modules/v8/generated.gypi',
     ],
     'variables': {
@@ skipping 95 matching lines @@
             'SharedPersistent.h',
             'SourceLocation.cpp',
             'SourceLocation.h',
             'Transferables.h',
             'ToV8.cpp',
             'ToV8.h',
             'V8AbstractEventListener.cpp',
             'V8AbstractEventListener.h',
             'V8Binding.cpp',
             'V8Binding.h',
+            'V8BindingMacros.cpp',
             'V8BindingMacros.h',
             'V8CacheOptions.h',
             'V8CacheStrategiesForCacheStorage.h',
             'V8DOMActivityLogger.cpp',
             'V8DOMActivityLogger.h',
             'V8DOMConfiguration.cpp',
             'V8DOMConfiguration.h',
             'V8DOMWrapper.cpp',
             'V8DOMWrapper.h',
             'V8ErrorHandler.cpp',
@@ skipping 70 matching lines @@
             'ScriptStreamerTest.cpp',
             'SerializedScriptValueTest.cpp',
             'ToV8Test.cpp',
             'V8BindingForTesting.cpp',
             'V8BindingForTesting.h',
             'V8BindingTest.cpp',
             'V8ScriptRunnerTest.cpp',
         ],
     },
 }