A fix for Issue 5139 "some plane-1 characters are not displayed correctly"....

webkit/port/platform/graphics/GlyphPageTreeNodeWin.cpp

Index: webkit/port/platform/graphics/GlyphPageTreeNodeWin.cpp
===================================================================
--- webkit/port/platform/graphics/GlyphPageTreeNodeWin.cpp	(revision 6411)
+++ webkit/port/platform/graphics/GlyphPageTreeNodeWin.cpp	(working copy)
@@ -204,7 +204,10 @@
     state.Init();
 
     for (unsigned i = 0; i < GlyphPage::size; i++) {
-        WORD glyph = state.FirstGlyphForCharacter(i);
+        // Each character in this input buffer is a surrogate pair, which
+        // consists of two UChars. So, the offset for its i-th character is
+        // (i * 2).
+        WORD glyph = state.FirstGlyphForCharacter(i * 2);
         if (glyph) {
             have_glyphs = true;
             page->setGlyphDataForIndex(i, glyph, fontData);