diff -urN chromium-26.0.1410.46.orig/third_party/WebKit/Source/WebCore/platform/graphics/harfbuzz/HarfBuzzShaper.cpp chromium-26.0.1410.46/third_party/WebKit/Source/WebCore/platform/graphics/harfbuzz/HarfBuzzShaper.cpp
--- chromium-26.0.1410.46.orig/third_party/WebKit/Source/WebCore/platform/graphics/harfbuzz/HarfBuzzShaper.cpp	2013-04-17 18:09:26.031613138 +0400
+++ chromium-26.0.1410.46/third_party/WebKit/Source/WebCore/platform/graphics/harfbuzz/HarfBuzzShaper.cpp	2013-04-17 18:12:13.263019259 +0400
@@ -329,6 +329,9 @@
         hb_buffer_set_script(harfBuzzBuffer.get(), currentRun->script());
         if (shouldSetDirection)
             hb_buffer_set_direction(harfBuzzBuffer.get(), currentRun->rtl() ? HB_DIRECTION_RTL : HB_DIRECTION_LTR);
+        else
+            // Leaving direction to HarfBuzz to guess is *really* bad, but will do for now.
+            hb_buffer_guess_segment_properties(harfBuzzBuffer.get());
 
         // Add a space as pre-context to the buffer. This prevents showing dotted-circle
         // for combining marks at the beginning of runs.