Stop disabling force_compositing_mode for background RenderViews.

content/renderer/gpu/null_output_surface.h

+// Copyright 2014 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef CONTENT_RENDERER_GPU_NULL_OUTPUT_SURFACE_H_
+#define CONTENT_RENDERER_GPU_NULL_OUTPUT_SURFACE_H_
+
+#include "cc/output/output_surface.h"
+
+namespace cc {
+class SoftwareOutputDevice;
+}
+
+namespace content {
+
+class NullOutputSurface : public cc::OutputSurface {
+ public:
+  NullOutputSurface()
+      : cc::OutputSurface(NULL, scoped_ptr<cc::SoftwareOutputDevice>()) {
+    capabilities_.delegated_rendering = true;
+  }
+  virtual ~NullOutputSurface() {}
+};
+
+}  // namespace content
+
+#endif  // CONTENT_RENDERER_GPU_NULL_OUTPUT_SURFACE_H_