Implemented window class on linux. Standalone demos are working on linux now.

gpu/demos/framework/window_linux.cc

 // Copyright (c) 2010 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 "gpu/demos/framework/window.h"
 
+#include <gdk/gdkx.h>
+#include <gtk/gtk.h>
+
+#include "base/utf_string_conversions.h"
+
+namespace {
+using gpu::demos::Window;
+
+gboolean OnDelete(GtkWidget* widget, GdkEventExpose* event) {
+  gtk_main_quit();
+  return FALSE;
+}
+
+gboolean OnExpose(GtkWidget* widget, GdkEventExpose* event, gpointer data) {
+  Window* window = static_cast<Window*>(data);
+  window->OnPaint();
+
+  // TODO(alokp): Figure out why this is crashing. Animation will not work
+  // until then.
+  //gtk_widget_queue_draw(widget);
+  return FALSE;
+}
+}  // namespace
+
 namespace gpu {
 namespace demos {
 
 void Window::MainLoop() {
+  gtk_signal_connect(GTK_OBJECT(window_handle_),
+                     "delete_event",
+                     reinterpret_cast<GtkSignalFunc>(OnDelete),
+                     NULL);
+  gtk_signal_connect(GTK_OBJECT(window_handle_),
+                     "expose_event",
+                     reinterpret_cast<GtkSignalFunc>(OnExpose),
+                     this);
+  gtk_main();
 }
 
 gfx::NativeWindow Window::CreateNativeWindow(const wchar_t* title,
                                              int width, int height) {
-  return NULL;
+  GtkWidget* hwnd = gtk_window_new(GTK_WINDOW_TOPLEVEL);
+
+  gtk_window_set_title(GTK_WINDOW(hwnd), WideToUTF8(title).c_str());
+  gtk_window_set_default_size(GTK_WINDOW(hwnd), width, height);
+  gtk_widget_set_double_buffered(hwnd, FALSE);
+  gtk_widget_set_app_paintable(hwnd, TRUE);
+
+  gtk_widget_show(hwnd);
+  return GTK_WINDOW(hwnd);
 }
 
 gfx::PluginWindowHandle Window::PluginWindow(gfx::NativeWindow hwnd) {
-  return gfx::kNullPluginWindow;
+  return GDK_WINDOW_XWINDOW(GTK_WIDGET(hwnd)->window);
 }
 
 }  // namespace demos
 }  // namespace gpu