aura: A few changes to have aura_demo compile and run on linux.

ui/gfx/linux_util.h

Index: ui/gfx/linux_util.h
diff --git a/ui/gfx/linux_util.h b/ui/gfx/linux_util.h
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+++ b/ui/gfx/linux_util.h
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+// Copyright (c) 2011 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_GFX_LINUX_UTIL_H_
+#define UI_GFX_LINUX_UTIL_H_
+#pragma once
+
+#include <glib-object.h>
+#include <stdint.h>
+
+#include <string>
+#include <vector>
+
+#include "base/memory/scoped_ptr.h"
+#include "ui/base/ui_export.h"
+
+typedef struct _PangoContext PangoContext;
+
+class SkBitmap;
+
+namespace gfx {
+
+class Rect;
+
+// Creates and returns a PangoContext. The caller owns the context.
+PangoContext* GetPangoContext();
+
+// Returns the resolution (DPI) used by pango. A negative values means the
+// resolution hasn't been set.
+double GetPangoResolution();
+
+// Change windows accelerator style to GTK style. (GTK uses _ for
+// accelerators.  Windows uses & with && as an escape for &.)
+UI_EXPORT std::string ConvertAcceleratorsFromWindowsStyle(
+    const std::string& label);
+
+// Removes the "&" accelerators from a Windows label.
+UI_EXPORT std::string RemoveWindowsStyleAccelerators(const std::string& label);
+
+// Makes a copy of |pixels| with the ordering changed from BGRA to RGBA.
+// The caller is responsible for free()ing the data. If |stride| is 0, it's
+// assumed to be 4 * |width|.
+uint8_t* BGRAToRGBA(const uint8_t* pixels, int width, int height, int stride);
+
+}  // namespace gfx
+
+// It's not legal C++ to have a templatized typedefs, so we wrap it in a
+// struct.  When using this, you need to include ::Type.  E.g.,
+// ScopedGObject<GdkPixbufLoader>::Type loader(gdk_pixbuf_loader_new());
+template<class T>
+struct ScopedGObject {
+  // A helper class that will g_object_unref |p| when it goes out of scope.
+  // This never adds a ref, it only unrefs.
+  template<class U>
+  struct GObjectUnrefer {
+    void operator()(U* ptr) const {
+      if (ptr)
+        g_object_unref(ptr);
+    }
+  };
+
+  typedef scoped_ptr_malloc<T, GObjectUnrefer<T> > Type;
+};
+
+#endif  // UI_GFX_LINUX_UTIL_H_