Mark SessionRestoreUITest.ShareProcessesOnRestore as flaky on Linux and Mac.

chrome/browser/sessions/session_restore_uitest.cc

Index: chrome/browser/sessions/session_restore_uitest.cc
diff --git a/chrome/browser/sessions/session_restore_uitest.cc b/chrome/browser/sessions/session_restore_uitest.cc
index e084d9c76b178cc141d7738007c5f7362c87e11b..068a35010bdd40f384490de58259831f98966bc3 100644
--- a/chrome/browser/sessions/session_restore_uitest.cc
+++ b/chrome/browser/sessions/session_restore_uitest.cc
@@ -438,13 +438,19 @@ TEST_F(SessionRestoreUITest,
   ASSERT_EQ(url1_, GetActiveTabURL());
 }
 
+#if defined(OS_LINUX) || defined(OS_MACOSX)
+// Flaky, sometimes times out: http://crbug.com/52022
+#define MAYBE_ShareProcessesOnRestore FLAKY_ShareProcessesOnRestore
+#else
+#define MAYBE_ShareProcessesOnRestore ShareProcessesOnRestore
+#endif
 // Make sure after a restore the number of processes matches that of the number
 // of processes running before the restore. This creates a new tab so that
 // we should have two new tabs running.  (This test will pass in both
 // process-per-site and process-per-site-instance, because we treat the new tab
 // as a special case in process-per-site-instance so that it only ever uses one
 // process.)
-TEST_F(SessionRestoreUITest, ShareProcessesOnRestore) {
+TEST_F(SessionRestoreUITest, MAYBE_ShareProcessesOnRestore) {
   if (in_process_renderer()) {
     // No point in running this test in single process mode.
     return;