Add WebKitPlatformSupport::createOffscreenGraphicsContext3D

content/renderer/renderer_webkitplatformsupport_impl.cc

Index: content/renderer/renderer_webkitplatformsupport_impl.cc
diff --git a/content/renderer/renderer_webkitplatformsupport_impl.cc b/content/renderer/renderer_webkitplatformsupport_impl.cc
index 80bb6fa3ef664a166e7bb60a761019a8cdc462ef..7e0f79603dbfe4fa535ee2c399189a0ebf55b4ad 100644
--- a/content/renderer/renderer_webkitplatformsupport_impl.cc
+++ b/content/renderer/renderer_webkitplatformsupport_impl.cc
@@ -581,6 +581,28 @@ RendererWebKitPlatformSupportImpl::createGraphicsContext3D() {
   }
 }
 
+WebKit::WebGraphicsContext3D*
+RendererWebKitPlatformSupportImpl::createOffscreenGraphicsContext3D(
+    const WebGraphicsContext3D::Attributes& attributes) {
+  // The WebGraphicsContext3DInProcessImpl code path is used for
+  // layout tests (though not through this code) as well as for
+  // debugging and bringing up new ports.
+  scoped_ptr<WebGraphicsContext3D> context;
+  if (CommandLine::ForCurrentProcess()->HasSwitch(switches::kInProcessWebGL)) {
+    context.reset(new webkit::gpu::WebGraphicsContext3DInProcessImpl(
+        gfx::kNullPluginWindow, NULL));
+  } else {
+#if defined(ENABLE_GPU)
+    context.reset(new WebGraphicsContext3DCommandBufferImpl());
+#else
+    return NULL;
+#endif
+  }
+  if (!context->initialize(attributes, NULL, false))
+    return NULL;
+  return context.release();
+}
+
 double RendererWebKitPlatformSupportImpl::audioHardwareSampleRate() {
   return audio_hardware::GetOutputSampleRate();
 }