Fix vector resize logic when encoding non-BMP chars to latin1 as ?s

third_party/WebKit/Source/wtf/text/TextCodecLatin1Test.cpp

Index: third_party/WebKit/Source/wtf/text/TextCodecLatin1Test.cpp
diff --git a/third_party/WebKit/Source/wtf/text/TextCodecLatin1Test.cpp b/third_party/WebKit/Source/wtf/text/TextCodecLatin1Test.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..71fb8d15b481e7334abd122a90d1dfbb237591df
--- /dev/null
+++ b/third_party/WebKit/Source/wtf/text/TextCodecLatin1Test.cpp
@@ -0,0 +1,39 @@
+// Copyright 2016 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.
+
+#include "wtf/text/TextCodecLatin1.h"
+
+#include "testing/gtest/include/gtest/gtest.h"
+#include "wtf/text/CString.h"
+#include "wtf/text/TextCodec.h"
+#include "wtf/text/TextEncoding.h"
+#include "wtf/text/TextEncodingRegistry.h"
+#include <memory>
+
+TEST(TextCodecLatin1Test, QuestionMarksAndSurrogates) {
+  WTF::TextEncoding encoding("windows-1252");
+  std::unique_ptr<WTF::TextCodec> codec(newTextCodec(encoding));
+
+  {
+    const LChar testCase[] = {0xd1, 0x16, 0x86};
+    size_t testCaseSize = WTF_ARRAY_LENGTH(testCase);
+    CString result = codec->encode(testCase, testCaseSize,
+                                   WTF::QuestionMarksForUnencodables);
+    EXPECT_STREQ("\xd1\x16?", result.data());
+  }
+  {
+    const UChar testCase[] = {0xd9f0, 0xdcd9};
+    size_t testCaseSize = WTF_ARRAY_LENGTH(testCase);
+    CString result = codec->encode(testCase, testCaseSize,
+                                   WTF::QuestionMarksForUnencodables);
+    EXPECT_STREQ("?", result.data());
+  }
+  {
+    const UChar testCase[] = {0xd9f0, 0xdcd9, 0xd9f0, 0xdcd9};
+    size_t testCaseSize = WTF_ARRAY_LENGTH(testCase);
+    CString result = codec->encode(testCase, testCaseSize,
+                                   WTF::QuestionMarksForUnencodables);
+    EXPECT_STREQ("??", result.data());
+  }
+}