Add a command-line flag to disable canvas antialiasing. This will be used to characterize performa…

webkit/glue/webpreferences.cc

Index: webkit/glue/webpreferences.cc
diff --git a/webkit/glue/webpreferences.cc b/webkit/glue/webpreferences.cc
index d5dd85e5eadb6f05b3d5d0d7dc81ac774940d428..13e5c519d8c40c9093d523192ab49b8fb390ec52 100644
--- a/webkit/glue/webpreferences.cc
+++ b/webkit/glue/webpreferences.cc
@@ -97,6 +97,7 @@ WebPreferences::WebPreferences()
       accelerated_compositing_for_video_enabled(false),
       accelerated_2d_canvas_enabled(false),
       deferred_2d_canvas_enabled(false),
+      antialiased_2d_canvas_disabled(false),
       accelerated_painting_enabled(false),
       accelerated_filters_enabled(false),
       gesture_tap_highlight_enabled(false),
@@ -388,6 +389,9 @@ void WebPreferences::Apply(WebView* web_view) const {
   // Enable deferred 2d canvas if requested on the command line.
   settings->setDeferred2dCanvasEnabled(deferred_2d_canvas_enabled);
 
+  // Disable antialiasing for 2d canvas if requested on the command line.
+  settings->setAntialiased2dCanvasEnabled(!antialiased_2d_canvas_disabled);
+
   // Enable gpu-accelerated painting if requested on the command line.
   settings->setAcceleratedPaintingEnabled(accelerated_painting_enabled);