Fix Hangul Tone Marks not to delimit in CachingWordShapeIterator

third_party/WebKit/Source/platform/fonts/shaping/CachingWordShaperTest.cpp

 // Copyright (c) 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.
 
 #include "platform/fonts/shaping/CachingWordShaper.h"
 
 #include "platform/fonts/CharacterRange.h"
 #include "platform/fonts/FontCache.h"
 #include "platform/fonts/GlyphBuffer.h"
 #include "platform/fonts/shaping/CachingWordShapeIterator.h"
@@ skipping 445 matching lines @@
 
     RefPtr<ShapeResult> wordResult;
     CachingWordShapeIterator iterator(cache.get(), textRun, &font);
 
     ASSERT_TRUE(iterator.next(&wordResult));
     EXPECT_EQ(2u, wordResult->numCharacters());
 
     ASSERT_FALSE(iterator.next(&wordResult));
 }
 
+TEST_F(CachingWordShaperTest, SegmentHangulToneMark)
+{
+    const UChar str[] = {
+        0xC740, // HANGUL SYLLABLE EUN
+        0x302E, // HANGUL SINGLE DOT TONE MARK
+        0x0
+    };
+    TextRun textRun(str, 2);
+
+    RefPtr<ShapeResult> wordResult;
+    CachingWordShapeIterator iterator(cache.get(), textRun, &font);
+
+    ASSERT_TRUE(iterator.next(&wordResult));
+    EXPECT_EQ(2u, wordResult->numCharacters());
+
+    ASSERT_FALSE(iterator.next(&wordResult));
+}
+
 TEST_F(CachingWordShaperTest, TextOrientationFallbackShouldNotInFallbackList)
 {
     const UChar str[] = {
         'A', // code point for verticalRightOrientationFontData()
         // Ideally we'd like to test uprightOrientationFontData() too
         // using code point such as U+3042, but it'd fallback to system
         // fonts as the glyph is missing.
         0x0
     };
     TextRun textRun(str, 1);
@@ skipping 23 matching lines @@
     float periodsAndSpacesWidth = shaper.width(&font, periodsAndSpaces, nullptr, &periodsAndSpacesGlyphBounds);
 
     // The total width of periods and spaces should be longer than the width of periods alone.
     ASSERT_GT(periodsAndSpacesWidth, periodsWidth);
 
     // The glyph bounds of periods and spaces should be longer than the glyph bounds of periods alone.
     ASSERT_GT(periodsAndSpacesGlyphBounds.width(), periodsGlyphBounds.width());
 }
 
 } // namespace blink