Stack sampling profiler: update to 10% full disable experiment

Stability and performance numbers from the current 50% GPU process enable rate
look good. Move on to the third experiment configuration in the associated bug,
to test performance impact of enabling the profiler for both GPU and browser
processes vs. enabling for neither process.

This CL deviates from the roll out percentages in the bug by performing the
experiment on 10% of launches rather than 50%. The experiment will be enabled
over the holiday period, so the lower percentage will provide enough data while
minimizing data volume differences for the browser process.

BUG=650869

Review-Url: https://codereview.chromium.org/2571483003
Cr-Commit-Position: refs/heads/master@{#437936}

chrome/common/stack_sampling_configuration.cc

@@ -128,7 +128,8 @@ void StackSamplingConfiguration::AppendCommandLineSwitchForChildProcess(
   DCHECK(IsBrowserProcess());
 
   if (process_type == switches::kGpuProcess &&
-      (configuration_ == PROFILE_GPU_PROCESS ||
+      (configuration_ == PROFILE_CONTROL ||
+       configuration_ == PROFILE_GPU_PROCESS ||
        configuration_ == PROFILE_BROWSER_AND_GPU_PROCESS)) {
     command_line->AppendSwitch(switches::kStartStackProfiler);
   }
@@ -180,18 +181,18 @@ StackSamplingConfiguration::GenerateConfiguration() {
       return ChooseConfiguration({
         { PROFILE_BROWSER_PROCESS, 0},
         { PROFILE_GPU_PROCESS, 0},
-        { PROFILE_BROWSER_AND_GPU_PROCESS, 50},
-        { PROFILE_CONTROL, 50},
-        { PROFILE_DISABLED, 0}
+        { PROFILE_BROWSER_AND_GPU_PROCESS, 80},
+        { PROFILE_CONTROL, 10},
+        { PROFILE_DISABLED, 10}
       });
 
     case version_info::Channel::DEV:
       return ChooseConfiguration({
         { PROFILE_BROWSER_PROCESS, 0},
         { PROFILE_GPU_PROCESS, 0},
-        { PROFILE_BROWSER_AND_GPU_PROCESS, 50},
-        { PROFILE_CONTROL, 50},
-        { PROFILE_DISABLED, 0}
+        { PROFILE_BROWSER_AND_GPU_PROCESS, 80},
+        { PROFILE_CONTROL, 10},
+        { PROFILE_DISABLED, 10}
       });
 
     default: