Track the region where text is painted.

Source/core/html/canvas/CanvasRenderingContext2D.cpp

Index: Source/core/html/canvas/CanvasRenderingContext2D.cpp
diff --git a/Source/core/html/canvas/CanvasRenderingContext2D.cpp b/Source/core/html/canvas/CanvasRenderingContext2D.cpp
index a26ab56f27bf2f7cc25c9019d06bf016b721835b..536f09816064331a3fa43099ea59fc42a4af6857 100644
--- a/Source/core/html/canvas/CanvasRenderingContext2D.cpp
+++ b/Source/core/html/canvas/CanvasRenderingContext2D.cpp
@@ -2201,9 +2201,9 @@ void CanvasRenderingContext2D::drawTextInternal(const String& text, float x, flo
         c->translate(location.x(), location.y());
         // We draw when fontWidth is 0 so compositing operations (eg, a "copy" op) still work.
         c->scale(FloatSize((fontWidth > 0 ? (width / fontWidth) : 0), 1));
-        c->drawBidiText(font, textRun, FloatPoint(0, 0), Font::UseFallbackIfFontNotReady);
+        c->drawBidiText(font, textRun, FloatPoint(0, 0), textRect, Font::UseFallbackIfFontNotReady);
     } else
-        c->drawBidiText(font, textRun, location, Font::UseFallbackIfFontNotReady);
+        c->drawBidiText(font, textRun, location, textRect, Font::UseFallbackIfFontNotReady);
 
     didDraw(textRect);
 }