Make it more obvious when our backing store has failed us.

chrome/browser/renderer_host/render_widget_host_view_gtk.cc

 // Copyright (c) 2006-2008 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 "chrome/browser/renderer_host/render_widget_host_view_gtk.h"
 
 #include <gtk/gtk.h>
 #include <gdk/gdk.h>
 #include <cairo/cairo.h>
 
 #include "base/logging.h"
+#include "base/gfx/gtk_util.h"
 #include "base/string_util.h"
 #include "chrome/common/native_web_keyboard_event.h"
 #include "chrome/common/x11_util.h"
 #include "chrome/browser/renderer_host/backing_store.h"
 #include "chrome/browser/renderer_host/render_widget_host.h"
 #include "webkit/glue/webinputevent.h"
 
 namespace {
 
 // This class is a simple convenience wrapper for Gtk functions. It has only
@@ skipping 311 matching lines @@
   bool use_shared_memory = x11_util::QuerySharedMemorySupport(display);
   int depth = gtk_widget_get_visual(view_.get())->depth;
 
   return new BackingStore(size, display, depth, visual, root_window,
                           use_render, use_shared_memory);
 }
 
 void RenderWidgetHostViewGtk::Paint(const gfx::Rect& damage_rect) {
   BackingStore* backing_store = host_->GetBackingStore();
 
+  GdkWindow* window = view_.get()->window;
   if (backing_store) {
     // Only render the widget if it is attached to a window; there's a short
     // period where this object isn't attached to a window but hasn't been
     // Destroy()ed yet and it receives paint messages...
-    GdkWindow* window = view_.get()->window;
     if (window) {
       backing_store->ShowRect(
           damage_rect, x11_util::GetX11WindowFromGtkWidget(view_.get()));
     }
   } else {
+    if (window) {
+      // Set the window background to sea foam green.
+      if (!gfx::kGdkSeafoamGreen.pixel) {
+        // We need the color "allocated" to use for the window background.
+        gdk_colormap_alloc_color(gdk_colormap_get_system(),
+                                 &gfx::kGdkSeafoamGreen,
+                                 FALSE /* not writable */,
+                                 TRUE /* best match */);
+      }
+      gdk_window_set_background(window, &gfx::kGdkSeafoamGreen);
+      gdk_window_clear(window);
+    }
     NOTIMPLEMENTED();
   }
 }