Enable GPU acceleration in 2D OffscreenCanvases on main thread

third_party/WebKit/Source/core/html/HTMLCanvasElement.cpp

Index: third_party/WebKit/Source/core/html/HTMLCanvasElement.cpp
diff --git a/third_party/WebKit/Source/core/html/HTMLCanvasElement.cpp b/third_party/WebKit/Source/core/html/HTMLCanvasElement.cpp
index e5c53023e278cb7e184deca631af9ea78433224e..01c7f3d58d609a6498a053f5caf3d758d91551db 100644
--- a/third_party/WebKit/Source/core/html/HTMLCanvasElement.cpp
+++ b/third_party/WebKit/Source/core/html/HTMLCanvasElement.cpp
@@ -766,8 +766,7 @@ bool HTMLCanvasElement::shouldAccelerate(const IntSize& size) const
     if (RuntimeEnabledFeatures::forceDisplayList2dCanvasEnabled())
         return false;
 
-    Settings* settings = document().settings();
-    if (!settings || !settings->accelerated2dCanvasEnabled())
+    if (!RuntimeEnabledFeatures::accelerated2dCanvasEnabled())
         return false;
 
     int canvasPixelCount = size.width() * size.height();
@@ -788,7 +787,8 @@ bool HTMLCanvasElement::shouldAccelerate(const IntSize& size) const
     }
 
     // Do not use acceleration for small canvas.
-    if (canvasPixelCount < settings->minimumAccelerated2dCanvasSize())
+    Settings* settings = document().settings();
+    if (!settings || canvasPixelCount < settings->minimumAccelerated2dCanvasSize())
         return false;
 
     if (!Platform::current()->canAccelerate2dCanvas())