Add utility method for WebString to base::FilePath conversion

third_party/WebKit/Source/platform/exported/FilePathConversionTest.cpp

+// 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 "public/platform/FilePathConversion.h"
+
+#include "base/files/file_path.h"
+#include "public/platform/WebString.h"
+#include "testing/gtest/include/gtest/gtest.h"
+#include "wtf/text/WTFString.h"
+
+namespace blink {
+
+TEST(FilePathConversionTest, convert)
+{
+    String test8bitString("path");
+    String test8bitLatin1("a\xC4");
+
+    static const UChar test[5] = { 0x0070, 0x0061, 0x0074, 0x0068, 0 }; // path
+    static const UChar testLatin1[3] = { 0x0061, 0x00C4, 0 }; // a\xC4
+    static const UChar testUTF16[3] = { 0x6587, 0x5B57, 0 }; // \u6587 \u5B57
+    String test16bitString(test);
+    String test16bitLatin1(testLatin1);
+    String test16bitUTF16(testUTF16);
+
+    // Latin1 a\xC4 == UTF8 a\xC3\x84
+    base::FilePath pathLatin1 = base::FilePath::FromUTF8Unsafe("a\xC3\x84");
+    // UTF16 \u6587\u5B57 == \xE6\x96\x87\xE5\xAD\x97
+    base::FilePath pathUTF16 = base::FilePath::FromUTF8Unsafe("\xE6\x96\x87\xE5\xAD\x97");
+
+    EXPECT_TRUE(test8bitString.is8Bit());
+    EXPECT_TRUE(test8bitLatin1.is8Bit());
+    EXPECT_FALSE(test16bitString.is8Bit());
+    EXPECT_FALSE(test16bitLatin1.is8Bit());
+
+    EXPECT_EQ(FILE_PATH_LITERAL("path"), WebStringToFilePath(test8bitString).value());
+    EXPECT_EQ(pathLatin1.value(), WebStringToFilePath(test8bitLatin1).value());
+    EXPECT_EQ(FILE_PATH_LITERAL("path"), WebStringToFilePath(test16bitString).value());
+    EXPECT_EQ(pathLatin1.value(), WebStringToFilePath(test16bitLatin1).value());
+    EXPECT_EQ(pathUTF16.value(), WebStringToFilePath(test16bitUTF16).value());
+}
+
+} // namespace blink