Backport 'add config to disable snapshots'.

Bug: 201691826
Test: m
Merged-In: I83d9ab4a15a862ea220debdd8da8b3d5673da276
Merged-In: Ibdff22eda7be6c91e2872e5ac3ae8f2fe1e65b69
Change-Id: I4914876e4925284d55951d16e472654ee599c619

core/res/res/values/config.xml

@@ -5049,4 +5049,7 @@
 
     <!-- the number of the max cached processes in the system. -->
     <integer name="config_customizedMaxCachedProcesses">32</integer>
+
+    <!-- Whether this device should support taking app snapshots on closure -->
+    <bool name="config_disableTaskSnapshots">false</bool>
 </resources>

core/res/res/values/symbols.xml

@@ -4403,7 +4403,7 @@
   <java-symbol type="string" name="view_and_control_notification_title" />
   <java-symbol type="string" name="view_and_control_notification_content" />
   <java-symbol type="array" name="config_accessibility_allowed_install_source" />
-  
+
   <!-- Translation -->
   <java-symbol type="string" name="ui_translation_accessibility_translated_text" />
   <java-symbol type="string" name="ui_translation_accessibility_translation_finished" />
@@ -4426,4 +4426,7 @@
   <java-symbol type="bool" name="config_volumeShowRemoteSessions" />
 
   <java-symbol type="integer" name="config_customizedMaxCachedProcesses" />
+
+  <java-symbol type="bool" name="config_disableTaskSnapshots" />
+
 </resources>

services/core/java/com/android/server/wm/TaskSnapshotController.java

@@ -118,6 +118,11 @@ class TaskSnapshotController {
      */
     private final boolean mIsRunningOnWear;
 
+    /**
+     * Flag indicating if device configuration has disabled app snapshots.
+     */
+    private final boolean mConfigDisableTaskSnapshots;
+
     TaskSnapshotController(WindowManagerService service) {
         mService = service;
         mPersister = new TaskSnapshotPersister(mService, Environment::getDataSystemCeDirectory);
@@ -131,6 +136,8 @@ class TaskSnapshotController {
             PackageManager.FEATURE_WATCH);
         mHighResTaskSnapshotScale = mService.mContext.getResources().getFloat(
                 com.android.internal.R.dimen.config_highResTaskSnapshotScale);
+        mConfigDisableTaskSnapshots = mService.mContext.getResources().getBoolean(
+                            com.android.internal.R.bool.config_disableTaskSnapshots);
     }
 
     void systemReady() {
@@ -488,7 +495,8 @@ class TaskSnapshotController {
     }
 
     boolean shouldDisableSnapshots() {
-        return mIsRunningOnWear || mIsRunningOnTv || mIsRunningOnIoT;
+        return mIsRunningOnWear || mIsRunningOnTv || mIsRunningOnIoT
+            || mConfigDisableTaskSnapshots;
     }
 
     /**