Plumbing explicit share groups through context creation

content/renderer/render_thread_impl.cc

Index: content/renderer/render_thread_impl.cc
diff --git a/content/renderer/render_thread_impl.cc b/content/renderer/render_thread_impl.cc
index 93e41b706e71251c34aa2e60ccdcffe7ffa8699a..590534f2c1b4f848770fc7e0b2b44df05838ea69 100644
--- a/content/renderer/render_thread_impl.cc
+++ b/content/renderer/render_thread_impl.cc
@@ -887,7 +887,8 @@ RenderThreadImpl::GetGpuFactories() {
                   gpu_channel_host.get(),
                   blink::WebGraphicsContext3D::Attributes(),
                   GURL("chrome://gpu/RenderThreadImpl::GetGpuVDAContext3D"),
-                  WebGraphicsContext3DCommandBufferImpl::SharedMemoryLimits())),
+                  WebGraphicsContext3DCommandBufferImpl::SharedMemoryLimits(),
+                  NULL)),
           "GPU-VideoAccelerator-Offscreen");
     }
   }
@@ -914,7 +915,8 @@ RenderThreadImpl::CreateOffscreenContext3d() {
           gpu_channel_host.get(),
           attributes,
           GURL("chrome://gpu/RenderThreadImpl::CreateOffscreenContext3d"),
-          WebGraphicsContext3DCommandBufferImpl::SharedMemoryLimits()));
+          WebGraphicsContext3DCommandBufferImpl::SharedMemoryLimits(),
+          NULL));
 }
 
 scoped_refptr<cc::ContextProvider>