Fixes bug in WidgetGtk. WidgetGtk::GetBounds can end up crashing. I...

views/widget/widget_gtk.cc

 // 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.
 
 #include "views/widget/widget_gtk.h"
 
 #include "app/drag_drop_types.h"
 #include "app/gfx/path.h"
 #include "app/os_exchange_data.h"
 #include "app/os_exchange_data_provider_gtk.h"
@@ skipping 48 matching lines @@
 static const char* kWidgetKey = "__VIEWS_WIDGET__";
 static const wchar_t* kWidgetWideKey = L"__VIEWS_WIDGET__";
 
 // Returns the position of a widget on screen.
 static void GetWidgetPositionOnScreen(GtkWidget* widget, int* x, int *y) {
   // First get the root window.
   GtkWidget* root = widget;
   while (root && !GTK_IS_WINDOW(root)) {
     root = gtk_widget_get_parent(root);
   }
-  DCHECK(root);
+  if (!root) {
+    // If root is null we're not parented. Return 0x0 and assume the caller will
+    // query again when we're parented.
+    *x = *y = 0;
+    return;
+  }
   // Translate the coordinate from widget to root window.
   gtk_widget_translate_coordinates(widget, root, 0, 0, x, y);
   // Then adjust the position with the position of the root window.
   int window_x, window_y;
   gtk_window_get_position(GTK_WINDOW(root), &window_x, &window_y);
   *x += window_x;
   *y += window_y;
 }
 
 // static
@@ skipping 1284 matching lines @@
 
 // static
 Widget* Widget::GetWidgetFromNativeWindow(gfx::NativeWindow native_window) {
   gpointer raw_widget = g_object_get_data(G_OBJECT(native_window), kWidgetKey);
   if (raw_widget)
     return reinterpret_cast<Widget*>(raw_widget);
   return NULL;
 }
 
 }  // namespace views