Enable GPU acceleration in 2D OffscreenCanvases on main thread

third_party/WebKit/Source/web/WebRuntimeFeatures.cpp

Index: third_party/WebKit/Source/web/WebRuntimeFeatures.cpp
diff --git a/third_party/WebKit/Source/web/WebRuntimeFeatures.cpp b/third_party/WebKit/Source/web/WebRuntimeFeatures.cpp
index eb8509840a81e53beb7388f1398cdf70e0af2546..a10e638a7f6f55dc55fb09387fcd4fa6ba09e786 100644
--- a/third_party/WebKit/Source/web/WebRuntimeFeatures.cpp
+++ b/third_party/WebKit/Source/web/WebRuntimeFeatures.cpp
@@ -60,6 +60,11 @@ void WebRuntimeFeatures::enableTestOnlyFeatures(bool enable)
     RuntimeEnabledFeatures::setTestFeaturesEnabled(enable);
 }
 
+void WebRuntimeFeatures::enableAccelerated2dCanvas(bool enable)
+{
+    RuntimeEnabledFeatures::setAccelerated2dCanvasEnabled(enable);
+}
+
 void WebRuntimeFeatures::enableAudioOutputDevices(bool enable)
 {
     RuntimeEnabledFeatures::setAudioOutputDevicesEnabled(enable);