Disable prerender on mobile for 1% users (retry).

chrome/browser/android/chrome_startup_flags.cc

Index: chrome/browser/android/chrome_startup_flags.cc
diff --git a/chrome/browser/android/chrome_startup_flags.cc b/chrome/browser/android/chrome_startup_flags.cc
index 88c2e2396318af8a29e46a5812583fc748f80486..84fec2a026b7ce83f91213114bac753291dead1a 100644
--- a/chrome/browser/android/chrome_startup_flags.cc
+++ b/chrome/browser/android/chrome_startup_flags.cc
@@ -35,9 +35,11 @@ void SetCommandLineSwitchASCII(const std::string& switch_string,
 }  // namespace
 
 void SetChromeSpecificCommandLineFlags() {
-  // Enable prerender for the omnibox.
+  // Enable prerender with holdback.
   SetCommandLineSwitchASCII(switches::kPrerenderMode,
-                            switches::kPrerenderModeSwitchValueEnabled);
+                            switches::kPrerenderModeSwitchValueAuto);
+
+  // Enable prerender for the omnibox.
   SetCommandLineSwitchASCII(switches::kPrerenderFromOmnibox,
                             switches::kPrerenderFromOmniboxSwitchValueEnabled);