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/sync/engine/idle_query_linux.h"
+#include "chrome/browser/ui/gtk/gtk_util.h"
+#include "ui/base/x/x11_util.h"
+
+namespace {
+
+class ScreensaverWindowFinder : public ui::EnumerateWindowsDelegate {
+ public:
+  ScreensaverWindowFinder()
+      : exists_(false) {}
+
+  bool exists() const { return exists_; }
+
+ protected:
+  virtual bool ShouldStopIterating(XID window) {
+    if (!ui::IsWindowVisible(window) || !IsScreensaverWindow(window))
+      return false;
+    exists_ = true;
+    return true;
+  }
+
+ private:
+  bool IsScreensaverWindow(XID window) const {
+    // It should occupy the full screen.
+    if (!ui::IsX11WindowFullScreen(window))
+      return false;
+
+    // For xscreensaver, the window should have _SCREENSAVER_VERSION property.
+    if (ui::PropertyExists(window, "_SCREENSAVER_VERSION"))
+      return true;
+
+    // For all others, like gnome-screensaver, the window's WM_CLASS property
+    // should contain "screensaver".
+    std::string value;
+    if (!ui::GetStringProperty(window, "WM_CLASS", &value))
+      return false;
+
+    return value.find("screensaver") != std::string::npos;
+  }
+
+  bool exists_;
+
+  DISALLOW_COPY_AND_ASSIGN(ScreensaverWindowFinder);
+};
+
+bool ScreensaverWindowExists() {
+  ScreensaverWindowFinder finder;
+  gtk_util::EnumerateTopLevelWindows(&finder);
+  return finder.exists();
+}
+
+}
 
 IdleState CalculateIdleState(unsigned int idle_threshold) {
+  // Usually the screensaver is used to lock the screen, so we do not need to
+  // check if the workstation is locked.
+  gdk_error_trap_push();
+  bool result = ScreensaverWindowExists();
+  bool got_error = gdk_error_trap_pop();
+  if (result && !got_error)
+    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;
 }