Do not show notifications when in fullscreen or screensaver mode....

chrome/browser/idle_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 "chrome/browser/idle.h"
 
+#include <gdk/gdk.h>
+#include <gdk/gdkx.h>
+
+#include <vector>
+
+#include "base/basictypes.h"
+#include "chrome/browser/fullscreen.h"
 #include "chrome/browser/sync/engine/idle_query_linux.h"
+#include "ui/base/x/x11_util.h"
+
+namespace {
+
+bool DoScreensaverCheck() {
+  XID root, parent, *children;
+  unsigned int num_children;
+  if (!XQueryTree(ui::GetXDisplay(),
+                  ui::GetX11RootWindow(),
+                  &root,
+                  &parent,
+                  &children,
+                  &num_children))
+    return false;
+
+  // XQueryTree returns the children of |window| in bottom-to-top order. So
+  // we build the list from top to bottom.
+  std::vector<XID> windows;
+  for (int i = static_cast<int>(num_children - 1); i >= 0; --i)
+    windows.push_back(children[i]);
+
+  XFree(children);
+
+  for (std::vector<XID>::iterator iter = windows.begin();
+       iter != windows.end(); ++iter) {
+    XID window = *iter;
+
+    // The screensaver window should be visible and full-screen.
+    if (!ui::IsWindowVisible(window) || !IsX11WindowFullScreen(window))
+      continue;
+
+    // For xscreensaver, the window should have _SCREENSAVER_VERSION property.
+    if (ui::ExistsProperty(window, "_SCREENSAVER_VERSION"))
+      return true;
+
+    // For all others, like gnome-screensaver, the window's WM_CLASS property
+    // should contains "screensaver".
+    std::string value;
+    if (ui::GetStringProperty(window, "WM_CLASS", &value)) {
+      size_t pos = 0, len = value.length();
+      while (pos < len) {
+        std::string str(value.c_str() + pos);
+        if (str.find("screensaver") != std::string::npos)
+          return true;
+        pos += str.length() + 1;
+      }
+    }
+  }
+
+  return false;
+}
+
+bool IsScreensaverRunning() {
+  gdk_error_trap_push();
+  bool is_screensaver_running = DoScreensaverCheck();
+  bool got_error = gdk_error_trap_pop();
+  return is_screensaver_running && !got_error;
+}
+
+}
 
 IdleState CalculateIdleState(unsigned int idle_threshold) {
+  // Usually screensaver is used to lock the screen. So we do not need to check
+  // if the workstation is locked.
+  if (IsScreensaverRunning())
+    return IDLE_STATE_LOCKED;
+
   browser_sync::IdleQueryLinux idle_query;
   unsigned int idle_time = idle_query.IdleTime();
   if (idle_time >= idle_threshold)
     return IDLE_STATE_IDLE;
   return IDLE_STATE_ACTIVE;
 }