Command line switch for canvas2d msaa

content/renderer/web_preferences.cc

Index: content/renderer/web_preferences.cc
diff --git a/content/renderer/web_preferences.cc b/content/renderer/web_preferences.cc
index b699878afcec90ec35b4520cf4e6bb4071c1edee..180fbe71f08e6a277dea8503d7c33f6bcb999adb 100644
--- a/content/renderer/web_preferences.cc
+++ b/content/renderer/web_preferences.cc
@@ -237,6 +237,11 @@ void ApplyWebPreferences(const WebPreferences& prefs, WebView* web_view) {
   settings->setAntialiased2dCanvasEnabled(
       !prefs.antialiased_2d_canvas_disabled);
 
+  // Set MSAA sample count for 2d canvas if requested on the command line (or
+  // default value if not).
+  settings->setAccelerated2dCanvasMSAASampleCount(
+      prefs.accelerated_2d_canvas_msaa_sample_count);
+
   // Enable gpu-accelerated filters if requested on the command line.
   settings->setAcceleratedFiltersEnabled(prefs.accelerated_filters_enabled);