Add uma histograms to startup config on Android

Change-Id: I6d0169f8f83ca8604daea50cf708ec78a9cfdace
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2295940
Auto-Submit: ssid <ssid@chromium.org>
Reviewed-by: Xi Han <hanxi@chromium.org>
Commit-Queue: ssid <ssid@chromium.org>
Cr-Commit-Position: refs/heads/master@{#788386}

components/tracing/common/trace_startup_config.cc

@@ -39,7 +39,8 @@ const base::FilePath::CharType kAndroidTraceConfigFile[] =
 
 const char kDefaultStartupCategories[] =
     "startup,browser,toplevel,toplevel.flow,ipc,EarlyJava,cc,Java,navigation,"
-    "loading,gpu,disabled-by-default-cpu_profiler,download_service,-*";
+    "loading,gpu,disabled-by-default-cpu_profiler,download_service,"
+    "disabled-by-default-histogram_samples,-*";
 #else
 const char kDefaultStartupCategories[] =
     "benchmark,toplevel,startup,disabled-by-default-file,toplevel.flow,"