Added ASSERT_SIZE macro for checking size of size-sensitive classes

third_party/WebKit/Source/wtf/wtf.gypi

 # For GN compatibility, this file can not have any conditions.
 {
     'variables': {
         'wtf_files': [
             'ASCIICType.cpp',
             'ASCIICType.h',
             'AddressSanitizer.h',
             'Alignment.h',
             'Allocator.h',
             'Assertions.cpp',
@@ skipping 52 matching lines @@
             'NotFound.h',
             'Optional.h',
             'PassRefPtr.h',
             'PrintStream.cpp',
             'PrintStream.h',
             'PtrUtil.h',
             'RefCounted.h',
             'RefPtr.h',
             'RetainPtr.h',
             'SaturatedArithmetic.h',
+            'SizeAssertions.h',
             'SizeLimits.cpp',
             'SpinLock.cpp',
             'SpinLock.h',
             'StaticConstructors.h',
             'StdLibExtras.h',
             'StringExtras.h',
             'StringHasher.h',
             'ThreadRestrictionVerifier.h',
             'ThreadSafeRefCounted.h',
             'ThreadSpecific.h',
@@ skipping 151 matching lines @@
             'text/StringOperatorsTest.cpp',
             'text/StringViewTest.cpp',
             'text/TextCodecTest.cpp',
             'text/TextCodecReplacementTest.cpp',
             'text/TextCodecUTF8Test.cpp',
             'text/WTFStringTest.cpp',
             'typed_arrays/ArrayBufferBuilderTest.cpp',
         ],
     },
 }