Re-land: Resurrect Aura Linux accessibility.

ui/gfx/native_widget_types.h

 // Copyright (c) 2012 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_NATIVE_WIDGET_TYPES_H_
 #define UI_GFX_NATIVE_WIDGET_TYPES_H_
 
 #include "build/build_config.h"
 
 #if defined(OS_ANDROID)
@@ skipping 88 matching lines @@
 
 #if defined(OS_ANDROID)
 struct ANativeWindow;
 namespace ui {
 class WindowAndroid;
 class ViewAndroid;
 }
 #endif
 class SkBitmap;
 
+#if defined(USE_X11) && !defined(OS_CHROMEOS)
+extern "C" {
+struct _AtkObject;
+typedef struct _AtkObject AtkObject;
+}
+#endif
+
 namespace gfx {
 
 #if defined(USE_AURA)
 typedef ui::Cursor NativeCursor;
 typedef aura::Window* NativeView;
 typedef aura::Window* NativeWindow;
 typedef SkRegion* NativeRegion;
 typedef ui::Event* NativeEvent;
 #elif defined(OS_IOS)
 typedef void* NativeCursor;
@@ skipping 38 matching lines @@
 typedef void* NativeViewAccessible;
 #endif  // __OBJC__
 #else  // Android, Linux, Chrome OS, etc.
 // Linux doesn't have a native font type.
 typedef void* NativeEditView;
 #if defined(USE_CAIRO)
 typedef cairo_t* NativeDrawingContext;
 #else
 typedef void* NativeDrawingContext;
 #endif  // defined(USE_CAIRO)
+#if defined(USE_X11) && !defined(OS_CHROMEOS)
+typedef AtkObject* NativeViewAccessible;
+#else
 typedef void* NativeViewAccessible;
 #endif
+#endif
 
 // A constant value to indicate that gfx::NativeCursor refers to no cursor.
 #if defined(USE_AURA)
 const int kNullCursor = 0;
 #else
 const gfx::NativeCursor kNullCursor = static_cast<gfx::NativeCursor>(NULL);
 #endif
 
 #if defined(OS_IOS)
 typedef UIImage NativeImageType;
@@ skipping 82 matching lines @@
 #elif defined(USE_OZONE)
 typedef intptr_t AcceleratedWidget;
 const AcceleratedWidget kNullAcceleratedWidget = 0;
 #else
 #error unknown platform
 #endif
 
 }  // namespace gfx
 
 #endif  // UI_GFX_NATIVE_WIDGET_TYPES_H_