This adds in the ability for Chrome to generate windows with snapshots
of all currently open tabs in all browsers.

This is needed for overview mode on ChromeOS.

BUG=http://code.google.com/p/chromium-os/issues/detail?id=1170
TEST=Ran Chrome under ChromeOS with updated window manager.
Review URL: http://codereview.chromium.org/661237

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@45824 0039d316-1c4b-4281-b951-d872f2087c98


CrOS-Libchrome-Original-Commit: d65adb173f09a837c96f96fc24a258f439e46e58
diff --git a/base/file_descriptor_posix.h b/base/file_descriptor_posix.h
index e9199ed..abc0789 100644
--- a/base/file_descriptor_posix.h
+++ b/base/file_descriptor_posix.h
@@ -24,6 +24,15 @@
       : fd(ifd),
         auto_close(iauto_close) { }
 
+  bool operator==(const FileDescriptor& other) const {
+    return (fd == other.fd && auto_close == other.auto_close);
+  }
+
+  // A comparison operator so that we can use these as keys in a std::map.
+  bool operator<(const FileDescriptor& other) const {
+    return other.fd < fd;
+  }
+
   int fd;
   // If true, this file descriptor should be closed after it has been used. For
   // example an IPC system might interpret this flag as indicating that the