gtk: refactor copy-pasted code

gfx/gtk_util.h

 // Copyright (c) 2009 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 GFX_GTK_UTIL_H_
 #define GFX_GTK_UTIL_H_
 #pragma once
 
 #include <glib-object.h>
 #include <stdint.h>
 
 #include <string>
 #include <vector>
 
 #include "base/scoped_ptr.h"
 
 typedef struct _GdkPixbuf GdkPixbuf;
 typedef struct _GdkRegion GdkRegion;
 
+class CommandLine;
 class SkBitmap;
 
 namespace gfx {
 
 class Rect;
 
+// Call gtk_init() using the argc and argv from command_line.
+// gtk_init() wants an argc and argv that it can mutate; we provide those,
+// but leave the original CommandLine unaltered.
+void GtkInitFromCommandLine(const CommandLine& command_line);
+
 // Convert and copy a SkBitmap to a GdkPixbuf. NOTE: this uses BGRAToRGBA, so
 // it is an expensive operation.  The returned GdkPixbuf will have a refcount of
 // 1, and the caller is responsible for unrefing it when done.
 GdkPixbuf* GdkPixbufFromSkBitmap(const SkBitmap* bitmap);
 
 // Modify the given region by subtracting the given rectangles.
 void SubtractRectanglesFromRegion(GdkRegion* region,
                                   const std::vector<Rect>& cutouts);
 
 // Returns the resolution (DPI) used by pango. A negative values means the
@@ skipping 28 matching lines @@
 
 // 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 {
   typedef scoped_ptr_malloc<T, GObjectUnrefer<T> > Type;
 };
 
 #endif  // GFX_GTK_UTIL_H_