Add create WGC3DInProcessCommandBuffer for on-screen context

webkit/tools/test_shell/test_shell_webkit_init.cc

Index: webkit/tools/test_shell/test_shell_webkit_init.cc
diff --git a/webkit/tools/test_shell/test_shell_webkit_init.cc b/webkit/tools/test_shell/test_shell_webkit_init.cc
index f09e117638c3a93f199cbf67f87722525dedfbc9..2dcbb6c0f6cd5db7fffdd2de5aa7a9751d287821 100644
--- a/webkit/tools/test_shell/test_shell_webkit_init.cc
+++ b/webkit/tools/test_shell/test_shell_webkit_init.cc
@@ -266,7 +266,8 @@ WebKit::WebIDBFactory* TestShellWebKitInit::idbFactory() {
 WebKit::WebGraphicsContext3D*
 TestShellWebKitInit::createOffscreenGraphicsContext3D(
     const WebKit::WebGraphicsContext3D::Attributes& attributes) {
-  return new webkit::gpu::WebGraphicsContext3DInProcessCommandBufferImpl(
+  using webkit::gpu::WebGraphicsContext3DInProcessCommandBufferImpl;
+  return WebGraphicsContext3DInProcessCommandBufferImpl::CreateOffscreenContext(
       attributes);
 }