Don't run InProcessBrowserTest.Empty when gtest_filter is specified. There are two reasons for this:

content/test/test_launcher.cc

 // Copyright (c) 2012 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 "content/test/test_launcher.h"
 
 #include <string>
 #include <vector>
 
 #include "base/command_line.h"
@@ skipping 617 matching lines @@
       "Starting tests...\n"
       "IMPORTANT DEBUGGING NOTE: each test is run inside its own process.\n"
       "For debugging a test inside a debugger, use the\n"
       "--gtest_filter=<your_test_name> flag along with either\n"
       "--single_process (to run all tests in one launcher/browser process) or\n"
       "--single-process (to do the above, and also run Chrome in single-\n"
       "process mode).\n");
 
   testing::InitGoogleTest(&argc, argv);
   TestTimeouts::Initialize();
+  int exit_code = 0;
 
   // Make sure the entire browser code is loaded into memory. Reading it
   // from disk may be slow on a busy bot, and can easily exceed the default
   // timeout causing flaky test failures. Use an empty test that only starts
   // and closes a browser with a long timeout to avoid those problems.
-  int exit_code = RunTest(launcher_delegate,
-                          kEmptyTestName,
-                          TestTimeouts::large_test_timeout_ms(),
-                          NULL);
-  if (exit_code != 0)
-    return exit_code;
+  // NOTE: we don't do this when specifying a filter because this slows down the
+  // common case of running one test locally, and also on trybots when sharding
+  // as this one test runs ~200 times and wastes a few minutes.
+  if (!should_shard && !command_line->HasSwitch(kGTestFilterFlag)) {
+    exit_code = RunTest(launcher_delegate,
+                        kEmptyTestName,
+                        TestTimeouts::large_test_timeout_ms(),
+                        NULL);
+    if (exit_code != 0)
+      return exit_code;
+  }
 
   int cycles = 1;
   if (command_line->HasSwitch(kGTestRepeatFlag)) {
     base::StringToInt(command_line->GetSwitchValueASCII(kGTestRepeatFlag),
                       &cycles);
   }
 
   while (cycles != 0) {
     if (!RunTests(launcher_delegate,
                   should_shard,
                   total_shards,
                   shard_index)) {
       exit_code = 1;
       break;
     }
 
     // Special value "-1" means "repeat indefinitely".
     if (cycles != -1)
       cycles--;
   }
   return exit_code;
 }
 
 }  // namespace test_launcher