am 0cb38d2e: Merge "Add configuration for activity thumbnails" into klp-modular-dev

* commit '0cb38d2e5ab32fd34c8129f3c2d1c158bad9abc3':
  Add configuration for activity thumbnails

core/res/res/values/config.xml

@@ -1487,6 +1487,9 @@
     <!-- default window inset isRound property -->
     <bool name="config_windowIsRound">false</bool>
 
+    <!-- default device has recents property -->
+    <bool name="config_hasRecents">true</bool>
+
     <!-- Defines the default set of global actions. Actions may still be disabled or hidden based
          on the current state of the device.
          Each item must be one of the following strings:

core/res/res/values/symbols.xml

@@ -291,6 +291,7 @@
   <java-symbol type="bool" name="config_forceDefaultOrientation" />
   <java-symbol type="bool" name="config_wifi_batched_scan_supported" />
   <java-symbol type="bool" name="config_windowIsRound" />
+  <java-symbol type="bool" name="config_hasRecents" />
 
   <java-symbol type="integer" name="config_cursorWindowSize" />
   <java-symbol type="integer" name="config_extraFreeKbytesAdjust" />

services/core/java/com/android/server/am/ActivityManagerService.java

@@ -1080,6 +1080,9 @@ public final class ActivityManagerService extends ActivityManagerNative
      */
     private boolean mUserIsMonkey;
 
+    /** Flag whether the device has a recents UI */
+    final boolean mHasRecents;
+
     final ServiceThread mHandlerThread;
     final MainHandler mHandler;
 
@@ -1963,6 +1966,9 @@ public final class ActivityManagerService extends ActivityManagerNative
         mConfigurationSeq = mConfiguration.seq = 1;
         mProcessCpuTracker.init();
 
+        mHasRecents = mContext.getResources().getBoolean(
+                com.android.internal.R.bool.config_hasRecents);
+
         mCompatModePackages = new CompatModePackages(this, systemDir, mHandler);
         mIntentFirewall = new IntentFirewall(new IntentFirewallInterface(), mHandler);
         mStackSupervisor = new ActivityStackSupervisor(this);

services/core/java/com/android/server/am/ActivityStack.java

@@ -754,7 +754,7 @@ final class ActivityStack {
         prev.task.touchActiveTime();
         clearLaunchTime(prev);
         final ActivityRecord next = mStackSupervisor.topRunningActivityLocked();
-        if (next == null || next.task != prev.task) {
+        if (mService.mHasRecents && (next == null || next.task != prev.task)) {
             prev.updateThumbnail(screenshotActivities(prev), null);
         }
         stopFullyDrawnTraceIfNeeded();