Track the region where text is painted.

Source/core/rendering/RenderFileUploadControl.cpp

Index: Source/core/rendering/RenderFileUploadControl.cpp
diff --git a/Source/core/rendering/RenderFileUploadControl.cpp b/Source/core/rendering/RenderFileUploadControl.cpp
index 437ced3d7d14b6ff4883bb7175a4fa0b7c732a42..4ef6872ff49fcef48e07980f698b6c97f49fbcb7 100644
--- a/Source/core/rendering/RenderFileUploadControl.cpp
+++ b/Source/core/rendering/RenderFileUploadControl.cpp
@@ -131,11 +131,12 @@ void RenderFileUploadControl::paintObject(PaintInfo& paintInfo, const LayoutPoin
         LayoutUnit buttonWidth = nodeWidth(button);
         LayoutUnit buttonAndIconWidth = buttonWidth + afterButtonSpacing
             + (input->icon() ? iconWidth + iconFilenameSpacing : 0);
+        float textWidth = font.width(textRun);
         LayoutUnit textX;
         if (style()->isLeftToRightDirection())
             textX = contentLeft + buttonAndIconWidth;
         else
-            textX = contentLeft + contentWidth() - buttonAndIconWidth - font.width(textRun);
+            textX = contentLeft + contentWidth() - buttonAndIconWidth - textWidth;
 
         LayoutUnit textY = 0;
         // We want to match the button's baseline
@@ -144,11 +145,13 @@ void RenderFileUploadControl::paintObject(PaintInfo& paintInfo, const LayoutPoin
             textY = paintOffset.y() + borderTop() + paddingTop() + buttonRenderer->baselinePosition(AlphabeticBaseline, true, HorizontalLine, PositionOnContainingLine);
         else
             textY = baselinePosition(AlphabeticBaseline, true, HorizontalLine, PositionOnContainingLine);
+        FloatRect textRect(textX, textY - style()->fontMetrics().ascent(),
+                           textWidth, style()->fontMetrics().height());
 
         paintInfo.context->setFillColor(style()->visitedDependentColor(CSSPropertyColor), style()->colorSpace());
         
         // Draw the filename
-        paintInfo.context->drawBidiText(font, textRun, IntPoint(roundToInt(textX), roundToInt(textY)));
+        paintInfo.context->drawBidiText(font, textRun, IntPoint(roundToInt(textX), roundToInt(textY)), textRect);
         
         if (input->icon()) {
             // Determine where the icon should be placed