telemetry: Make sure kernel pointers are not hidden

tools/telemetry/telemetry/core/platform/profiler/perf_profiler.py

Index: tools/telemetry/telemetry/core/platform/profiler/perf_profiler.py
diff --git a/tools/telemetry/telemetry/core/platform/profiler/perf_profiler.py b/tools/telemetry/telemetry/core/platform/profiler/perf_profiler.py
index b5eaae90ad62eee13630a5413fd256d49d2d7fc2..97c6dbc28369a29fbd8c6101b64b8a5b2ed45f99 100644
--- a/tools/telemetry/telemetry/core/platform/profiler/perf_profiler.py
+++ b/tools/telemetry/telemetry/core/platform/profiler/perf_profiler.py
@@ -162,6 +162,9 @@ class PerfProfiler(profiler.Profiler):
     if platform_backend.GetOSName() == 'android':
       android_prebuilt_profiler_helper.InstallOnDevice(
           browser_backend.adb.Adb(), 'perf')
+      # Make sure kernel pointers are not hidden.
+      browser_backend.adb.Adb().SetProtectedFileContents(
+          '/proc/sys/kernel/kptr_restrict', '0')
     for pid, output_file in process_output_file_map.iteritems():
       if 'zygote' in output_file:
         continue