Stop combining text runs which are connected by 'COMMON' blocks.

ui/gfx/render_text.h

 // Copyright (c) 2012 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.
 
 #ifndef UI_GFX_RENDER_TEXT_H_
 #define UI_GFX_RENDER_TEXT_H_
 
 #include <algorithm>
 #include <cstring>
 #include <string>
@@ skipping 619 matching lines @@
   FRIEND_TEST_ALL_PREFIXES(RenderTextTest, GraphemePositions);
   FRIEND_TEST_ALL_PREFIXES(RenderTextTest, MinLineHeight);
   FRIEND_TEST_ALL_PREFIXES(RenderTextTest, EdgeSelectionModels);
   FRIEND_TEST_ALL_PREFIXES(RenderTextTest, GetTextOffset);
   FRIEND_TEST_ALL_PREFIXES(RenderTextTest, GetTextOffsetHorizontalDefaultInRTL);
   FRIEND_TEST_ALL_PREFIXES(RenderTextTest, Multiline_MinWidth);
   FRIEND_TEST_ALL_PREFIXES(RenderTextTest, Multiline_NormalWidth);
   FRIEND_TEST_ALL_PREFIXES(RenderTextTest, Multiline_SufficientWidth);
   FRIEND_TEST_ALL_PREFIXES(RenderTextTest, Multiline_Newline);
   FRIEND_TEST_ALL_PREFIXES(RenderTextTest, Multiline_WordWrapBehavior);
+  FRIEND_TEST_ALL_PREFIXES(RenderTextTest, Multiline_LineBreakerBehavior);
+  FRIEND_TEST_ALL_PREFIXES(RenderTextTest,
+                           Multiline_SurrogatePairsOrCombiningChars);
+  FRIEND_TEST_ALL_PREFIXES(RenderTextTest, Multiline_ZeroWidthChars);
   FRIEND_TEST_ALL_PREFIXES(RenderTextTest, NewlineWithoutMultilineFlag);
   FRIEND_TEST_ALL_PREFIXES(RenderTextTest, GlyphBounds);
   FRIEND_TEST_ALL_PREFIXES(RenderTextTest, HarfBuzz_GlyphBounds);
   FRIEND_TEST_ALL_PREFIXES(RenderTextTest,
                            MoveCursorLeftRight_MeiryoUILigatures);
   FRIEND_TEST_ALL_PREFIXES(RenderTextTest, Win_LogicalClusters);
   FRIEND_TEST_ALL_PREFIXES(RenderTextTest, SameFontForParentheses);
   FRIEND_TEST_ALL_PREFIXES(RenderTextTest, BreakRunsByUnicodeBlocks);
   FRIEND_TEST_ALL_PREFIXES(RenderTextTest, PangoAttributes);
   FRIEND_TEST_ALL_PREFIXES(RenderTextTest, StringFitsOwnWidth);
@@ skipping 157 matching lines @@
   // Lines computed by EnsureLayout. These should be invalidated upon
   // OnLayoutTextAttributeChanged and OnDisplayTextAttributeChanged calls.
   std::vector<internal::Line> lines_;
 
   DISALLOW_COPY_AND_ASSIGN(RenderText);
 };
 
 }  // namespace gfx
 
 #endif  // UI_GFX_RENDER_TEXT_H_