Don't set accelerated compositing to true in WebView. It's already defaulted to true.

content/renderer/render_view_impl.cc

Index: content/renderer/render_view_impl.cc
diff --git a/content/renderer/render_view_impl.cc b/content/renderer/render_view_impl.cc
index 23e0b1d8215d38dbc9e9431d9eb3a1f6a2d07520..1e611815e3cc9e0c49a1bc37359991d38ca4388c 100644
--- a/content/renderer/render_view_impl.cc
+++ b/content/renderer/render_view_impl.cc
@@ -1045,9 +1045,6 @@ void RenderView::ApplyWebPreferences(const WebPreferences& prefs,
 
   settings->setLayerSquashingEnabled(prefs.layer_squashing_enabled);
 
-  // Enable gpu-accelerated compositing always.
-  settings->setAcceleratedCompositingEnabled(true);

[jamesr, 2014/07/22 01:05:04]

for the record,
https://code.google.com/p/chromium/codesearch#chromium/src/third_party/WebKit...
sets this to true by default

-
   // Enable gpu-accelerated 2d canvas if requested on the command line.
   settings->setAccelerated2dCanvasEnabled(prefs.accelerated_2d_canvas_enabled);