chromeos: Add pref for automated brightness increases.

chromeos/dbus/power_policy_controller.cc

Index: chromeos/dbus/power_policy_controller.cc
diff --git a/chromeos/dbus/power_policy_controller.cc b/chromeos/dbus/power_policy_controller.cc
index 970ff117925214f962548f5fee6c25c20494c59f..40621c840423fbfeaf112ceb0c0a1e77c1f98e14 100644
--- a/chromeos/dbus/power_policy_controller.cc
+++ b/chromeos/dbus/power_policy_controller.cc
@@ -88,7 +88,8 @@ PowerPolicyController::PrefValues::PrefValues()
       enable_auto_screen_lock(false),
       presentation_screen_dim_delay_factor(1.0),
       user_activity_screen_dim_delay_factor(1.0),
-      wait_for_initial_user_activity(false) {}
+      wait_for_initial_user_activity(false),
+      force_nonzero_brightness_for_user_activity(true) {}
 
 // static
 std::string PowerPolicyController::GetPolicyDebugString(
@@ -128,6 +129,10 @@ std::string PowerPolicyController::GetPolicyDebugString(
     str += base::StringPrintf("wait_for_initial_user_activity=%d ",
         policy.wait_for_initial_user_activity());
   }
+  if (policy.has_force_nonzero_brightness_for_user_activity()) {
+    str += base::StringPrintf("force_nonzero_brightness_for_user_activity=%d ",
+        policy.force_nonzero_brightness_for_user_activity());
+  }
   if (policy.has_reason())
     str += base::StringPrintf("reason=\"%s\" ", policy.reason().c_str());
   base::TrimWhitespace(str, base::TRIM_TRAILING, &str);
@@ -210,6 +215,8 @@ void PowerPolicyController::ApplyPrefs(const PrefValues& values) {
       values.user_activity_screen_dim_delay_factor);
   prefs_policy_.set_wait_for_initial_user_activity(
       values.wait_for_initial_user_activity);
+  prefs_policy_.set_force_nonzero_brightness_for_user_activity(
+      values.force_nonzero_brightness_for_user_activity);
 
   honor_screen_wake_locks_ = values.allow_screen_wake_locks;