Merge changes from topic "presubmit-am-6f72bdc3cc444506871d5647fce4bbd2" into tm-mainline-prod

* changes:
  [automerge] Add the ability to restrict dreams to the system user. 2p: 789f052027
  Add the ability to restrict dreams to the system user.

core/res/res/values/config.xml

@@ -2403,6 +2403,8 @@
     <integer name="config_dreamsBatteryLevelDrainCutoff">5</integer>
     <!-- Limit of how long the device can remain unlocked due to attention checking.  -->
     <integer name="config_attentionMaximumExtension">900000</integer> <!-- 15 minutes.  -->
+    <!-- Is the system user the only user allowed to dream. -->
+    <bool name="config_dreamsOnlyEnabledForSystemUser">false</bool>
 
     <!-- The prefix of dream component names that are loggable. If empty, logs "other" for all. -->
     <string name ="config_loggable_dream_prefix" translatable="false"></string>

core/res/res/values/symbols.xml

@@ -2216,6 +2216,7 @@
   <java-symbol type="integer" name="config_dreamsBatteryLevelMinimumWhenNotPowered" />
   <java-symbol type="integer" name="config_dreamsBatteryLevelDrainCutoff" />
   <java-symbol type="string" name="config_dreamsDefaultComponent" />
+  <java-symbol type="bool" name="config_dreamsOnlyEnabledForSystemUser" />
   <java-symbol type="array" name="config_supportedDreamComplications" />
   <java-symbol type="array" name="config_dreamComplicationsEnabledByDefault" />
   <java-symbol type="array" name="config_disabledDreamComponents" />

services/core/java/com/android/server/dreams/DreamManagerService.java

@@ -92,6 +92,7 @@ public final class DreamManagerService extends SystemService {
     private boolean mCurrentDreamIsDozing;
     private boolean mCurrentDreamIsWaking;
     private boolean mForceAmbientDisplayEnabled;
+    private boolean mDreamsOnlyEnabledForSystemUser;
     private int mCurrentDreamDozeScreenState = Display.STATE_UNKNOWN;
     private int mCurrentDreamDozeScreenBrightness = PowerManager.BRIGHTNESS_DEFAULT;
 
@@ -115,6 +116,8 @@ public final class DreamManagerService extends SystemService {
                 mContext.getResources().getString(R.string.config_loggable_dream_prefix));
         AmbientDisplayConfiguration adc = new AmbientDisplayConfiguration(mContext);
         mAmbientDisplayComponent = ComponentName.unflattenFromString(adc.ambientDisplayComponent());
+        mDreamsOnlyEnabledForSystemUser =
+                mContext.getResources().getBoolean(R.bool.config_dreamsOnlyEnabledForSystemUser);
     }
 
     @Override
@@ -156,6 +159,7 @@ public final class DreamManagerService extends SystemService {
         pw.println("mCurrentDreamIsDozing=" + mCurrentDreamIsDozing);
         pw.println("mCurrentDreamIsWaking=" + mCurrentDreamIsWaking);
         pw.println("mForceAmbientDisplayEnabled=" + mForceAmbientDisplayEnabled);
+        pw.println("mDreamsOnlyEnabledForSystemUser=" + mDreamsOnlyEnabledForSystemUser);
         pw.println("mCurrentDreamDozeScreenState="
                 + Display.stateToString(mCurrentDreamDozeScreenState));
         pw.println("mCurrentDreamDozeScreenBrightness=" + mCurrentDreamDozeScreenBrightness);
@@ -314,6 +318,11 @@ public final class DreamManagerService extends SystemService {
     }
 
     private ComponentName[] getDreamComponentsForUser(int userId) {
+        if (!dreamsEnabledForUser(userId)) {
+            // Don't return any dream components if the user is not allowed to dream.
+            return null;
+        }
+
         String names = Settings.Secure.getStringForUser(mContext.getContentResolver(),
                 Settings.Secure.SCREENSAVER_COMPONENTS,
                 userId);
@@ -367,6 +376,10 @@ public final class DreamManagerService extends SystemService {
 
     }
 
+    private boolean dreamsEnabledForUser(int userId) {
+        return !mDreamsOnlyEnabledForSystemUser || (userId == UserHandle.USER_SYSTEM);
+    }
+
     private ServiceInfo getServiceInfo(ComponentName name) {
         try {
             return name != null ? mContext.getPackageManager().getServiceInfo(name,