Revert of ozone: Remove singleton pattern for SurfaceFactoryOzone.

ui/ozone/public/surface_factory_ozone.h

 // Copyright (c) 2013 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 UI_OZONE_PUBLIC_SURFACE_FACTORY_OZONE_H_
 #define UI_OZONE_PUBLIC_SURFACE_FACTORY_OZONE_H_
 
 #include "base/callback.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/native_library.h"
+#include "ui/gfx/geometry/point.h"
+#include "ui/gfx/geometry/rect.h"
 #include "ui/gfx/geometry/rect.h"
 #include "ui/gfx/native_widget_types.h"
 #include "ui/gfx/overlay_transform.h"
 #include "ui/ozone/ozone_base_export.h"
 
+class SkBitmap;
+class SkCanvas;
+
 namespace ui {
 
 class NativePixmap;
 class SurfaceOzoneCanvas;
 class SurfaceOzoneEGL;
 
 // The Ozone interface allows external implementations to hook into Chromium to
 // provide a system specific implementation. The Ozone interface supports two
 // drawing modes: 1) accelerated drawing through EGL and 2) software drawing
 // through Skia.
@@ skipping 40 matching lines @@
     MAP,
     PERSISTENT_MAP,
     SCANOUT,
   };
 
   typedef void* (*GLGetProcAddressProc)(const char* name);
   typedef base::Callback<void(base::NativeLibrary)> AddGLLibraryCallback;
   typedef base::Callback<void(GLGetProcAddressProc)>
       SetGLGetProcAddressProcCallback;
 
+  SurfaceFactoryOzone();
+  virtual ~SurfaceFactoryOzone();
+
+  // Returns the singleton instance.
+  static SurfaceFactoryOzone* GetInstance();
+
   // Returns native platform display handle. This is used to obtain the EGL
   // display connection for the native display.
   virtual intptr_t GetNativeDisplay();
 
   // Create SurfaceOzoneEGL for the specified gfx::AcceleratedWidget.
   //
   // Note: When used from content, this is called in the GPU process. The
   // platform must support creation of SurfaceOzoneEGL from the GPU process
   // using only the handle contained in gfx::AcceleratedWidget.
   virtual scoped_ptr<SurfaceOzoneEGL> CreateEGLSurfaceForWidget(
@@ skipping 55 matching lines @@
 
   // Returns true if overlays can be shown at z-index 0, replacing the main
   // surface. Combined with surfaceless extensions, it allows for an
   // overlay-only mode.
   virtual bool CanShowPrimaryPlaneAsOverlay();
 
   // Returns true if the platform is able to create buffers for a specific usage
   // such as MAP for zero copy or SCANOUT for display controller.
   virtual bool CanCreateNativePixmap(BufferUsage usage);
 
- protected:
-  SurfaceFactoryOzone();
-  virtual ~SurfaceFactoryOzone();
-
  private:
-  DISALLOW_COPY_AND_ASSIGN(SurfaceFactoryOzone);
+  static SurfaceFactoryOzone* impl_;  // not owned
 };
 
 }  // namespace ui
 
 #endif  // UI_OZONE_PUBLIC_SURFACE_FACTORY_OZONE_H_