compile on openbsd: mostly ifdefs and missing includes,...

base/gfx/native_widget_types.h

Index: base/gfx/native_widget_types.h
===================================================================
--- base/gfx/native_widget_types.h	(revision 17958)
+++ base/gfx/native_widget_types.h	(working copy)
@@ -46,7 +46,7 @@
 class NSWindow;
 class NSTextField;
 #endif  // __OBJC__
-#elif defined(OS_LINUX)
+#elif defined(OS_LINUX) || defined(OS_OPENBSD)
 typedef struct _GdkCursor GdkCursor;
 typedef struct _GtkWidget GtkWidget;
 typedef struct _GtkWindow GtkWindow;
@@ -69,7 +69,7 @@
 typedef CGContext* NativeDrawingContext;
 typedef void* NativeCursor;
 typedef void* NativeMenu;
-#elif defined(OS_LINUX)
+#elif defined(OS_LINUX) || defined(OS_OPENBSD)
 typedef GtkWidget* NativeView;
 typedef GtkWindow* NativeWindow;
 typedef GtkWidget* NativeEditView;
@@ -93,7 +93,7 @@
 static inline NativeView NativeViewFromId(NativeViewId id) {
   return reinterpret_cast<NativeView>(id);
 }
-#elif defined(OS_LINUX)
+#elif defined(OS_LINUX) || defined(OS_OPENBSD)
 // A NativeView on Linux is a GtkWidget*. However, we can't go directly from an
 // X window ID to a GtkWidget. Thus, functions which handle NativeViewIds from
 // the renderer have to use Xlib. This is fine since these functions are
@@ -101,7 +101,7 @@
 
 #define NativeViewFromId(x) NATIVE_VIEW_FROM_ID_NOT_AVAILIBLE_ON_LINUX
 
-#endif  // defined(OS_LINUX)
+#endif  // defined(OS_LINUX) || defined(OS_OPENBSD)
 
 // Convert a NativeView to a NativeViewId. See the comments above
 // NativeViewFromId.
@@ -109,10 +109,10 @@
 static inline NativeViewId IdFromNativeView(NativeView view) {
   return reinterpret_cast<NativeViewId>(view);
 }
-#elif defined(OS_LINUX)
+#elif defined(OS_LINUX) || defined(OS_OPENBSD)
 // Not inlined because it involves pulling too many headers.
 NativeViewId IdFromNativeView(NativeView view);
-#endif  // defined(OS_LINUX)
+#endif  // defined(OS_LINUX) || defined(OS_OPENBSD)
 
 }  // namespace gfx