Make EImageRendering an enum class.

third_party/WebKit/Source/core/paint/HTMLCanvasPainter.cpp

Index: third_party/WebKit/Source/core/paint/HTMLCanvasPainter.cpp
diff --git a/third_party/WebKit/Source/core/paint/HTMLCanvasPainter.cpp b/third_party/WebKit/Source/core/paint/HTMLCanvasPainter.cpp
index 940a2636de23cc8c0a03af5e5740bb78241af41e..a6411b297992cb14fef4eca6dadcf3d7ca13431b 100644
--- a/third_party/WebKit/Source/core/paint/HTMLCanvasPainter.cpp
+++ b/third_party/WebKit/Source/core/paint/HTMLCanvasPainter.cpp
@@ -56,10 +56,11 @@ void HTMLCanvasPainter::PaintReplaced(const PaintInfo& paint_info,
   // is set.  See bug for more details: crbug.com/353716.
   InterpolationQuality interpolation_quality =
       layout_html_canvas_.Style()->ImageRendering() ==
-              kImageRenderingOptimizeContrast
+              EImageRendering::kOptimizeContrast
           ? kInterpolationLow
           : CanvasDefaultInterpolationQuality;
-  if (layout_html_canvas_.Style()->ImageRendering() == kImageRenderingPixelated)
+  if (layout_html_canvas_.Style()->ImageRendering() ==
+      EImageRendering::kPixelated)
     interpolation_quality = kInterpolationNone;
 
   InterpolationQuality previous_interpolation_quality =