Disable all the tests that are flaking more than 5% on Linux builders.

base/process/process_metrics_unittest.cc

 // Copyright 2013 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 "base/process/process_metrics.h"
 
 #include <sstream>
 #include <string>
 
 #include "base/threading/thread.h"
@@ skipping 311 matching lines @@
       "16 0 1 0 1676099790 2957312 114 4294967295 134512640 134528148 "
       "3221224832 3221224344 3086339742 0 0 0 0 0 0 0 17 0 0 0";
 
   EXPECT_EQ(0, base::ParseProcStatCPU(kSelfStat));
 }
 #endif // defined(OS_LINUX) || defined(OS_ANDROID)
 
 // Disable on Android because base_unittests runs inside a Dalvik VM that
 // starts and stop threads (crbug.com/175563).
 #if defined(OS_LINUX)
-TEST(ProcessMetricsTest, GetNumberOfThreads) {
+// http://crbug.com/396455
+TEST(ProcessMetricsTest, DISABLED_GetNumberOfThreads) {
   const base::ProcessHandle current = base::GetCurrentProcessHandle();
   const int initial_threads = base::GetNumberOfThreads(current);
   ASSERT_GT(initial_threads, 0);
   const int kNumAdditionalThreads = 10;
   {
     scoped_ptr<base::Thread> my_threads[kNumAdditionalThreads];
     for (int i = 0; i < kNumAdditionalThreads; ++i) {
       my_threads[i].reset(new base::Thread("GetNumberOfThreadsTest"));
       my_threads[i]->Start();
       ASSERT_EQ(base::GetNumberOfThreads(current), initial_threads + 1 + i);
     }
   }
   // The Thread destructor will stop them.
   ASSERT_EQ(initial_threads, base::GetNumberOfThreads(current));
 }
 #endif  // defined(OS_LINUX)
 
 }  // namespace debug
 }  // namespace base