Compute and use BiDi information in SVGTextMetricsBuilder

Source/core/rendering/svg/SVGTextMetrics.h

Index: Source/core/rendering/svg/SVGTextMetrics.h
diff --git a/Source/core/rendering/svg/SVGTextMetrics.h b/Source/core/rendering/svg/SVGTextMetrics.h
index 8c3bb26bb51c9010609126a7198dba0c4d09f5b9..b45d4c75c675824601b5b258821f4b3844c69960 100644
--- a/Source/core/rendering/svg/SVGTextMetrics.h
+++ b/Source/core/rendering/svg/SVGTextMetrics.h
@@ -21,6 +21,7 @@
 #define SVGTextMetrics_h
 
 #include "platform/fonts/Glyph.h"
+#include "platform/text/TextDirection.h"
 #include "wtf/text/WTFString.h"
 
 namespace WebCore {
@@ -39,9 +40,13 @@ public:
     SVGTextMetrics(MetricsType);
     SVGTextMetrics(RenderSVGInlineText*, unsigned position, unsigned length, float width, Glyph glyphNameGlyphId);
 
+    // FIXME: Migrate away from these to the two below.
     static SVGTextMetrics measureCharacterRange(RenderSVGInlineText*, unsigned position, unsigned length);
     static TextRun constructTextRun(RenderSVGInlineText*, unsigned position, unsigned length);
 
+    static SVGTextMetrics measureCharacterRange(RenderSVGInlineText*, unsigned position, unsigned length, TextDirection);
+    static TextRun constructTextRun(RenderSVGInlineText*, unsigned position, unsigned length, TextDirection);
+
     bool isEmpty() const { return !m_width && !m_height && m_length <= 1; }
 
     float width() const { return m_width; }