Add autoclick to settings page under the accessibility section.

chrome/common/pref_names.cc

Index: chrome/common/pref_names.cc
diff --git a/chrome/common/pref_names.cc b/chrome/common/pref_names.cc
index 92534d1b43d40f0a76fbedcc9cdf5b07319ed8f1..9fb06ba67ae33078a24221746210fa9c9ca907a7 100644
--- a/chrome/common/pref_names.cc
+++ b/chrome/common/pref_names.cc
@@ -717,6 +717,9 @@ const char kScreenMagnifierScale[] = "settings.a11y.screen_magnifier_scale";
 const char kVirtualKeyboardEnabled[] = "settings.a11y.virtual_keyboard";
 // A boolean pref which determines whether autoclick is enabled.
 const char kAutoclickEnabled[] = "settings.a11y.autoclick";
+// An integer pref which determines time in ms between when the mouse cursor
+// stops and when an autoclick is triggered.
+const char kAutoclickDelayMs[] = "settings.a11y.autoclick_delay_ms";
 // A boolean pref which determines whether the accessibility menu shows
 // regardless of the state of a11y features.
 const char kShouldAlwaysShowAccessibilityMenu[] = "settings.a11y.enable_menu";