Setup AnrController for StorageManagerService

If transcoding is enabled, the StorageManagerService configures an
AnrController to allow delaying the ANR dialog when apps are
transcoding.

In later cl, the actual delay will be delegated to the
ExternalStorageService (MediaProvider).

Test: Manual
Bug: 170486601
Change-Id: Iafefba6a24cca1da7a73c5364f34893bf1868bea

services/core/java/com/android/server/StorageManagerService.java

@@ -890,7 +890,7 @@ class StorageManagerService extends IStorageManager.Stub
             ZramWriteback.scheduleZramWriteback(mContext);
         }
 
-        updateTranscodeEnabled();
+        configureTranscoding();
     }
 
     /**
@@ -922,7 +922,7 @@ class StorageManagerService extends IStorageManager.Stub
         }
     }
 
-    private void updateTranscodeEnabled() {
+    private void configureTranscoding() {
         // See MediaProvider TranscodeHelper#getBooleanProperty for more information
         boolean transcodeEnabled = false;
         boolean defaultValue = true;
@@ -935,6 +935,15 @@ class StorageManagerService extends IStorageManager.Stub
                     "transcode_enabled", defaultValue);
         }
         SystemProperties.set("sys.fuse.transcode_enabled", String.valueOf(transcodeEnabled));
+
+        if (transcodeEnabled) {
+            LocalServices.getService(ActivityManagerInternal.class)
+                    .registerAnrController((packageName, uid) -> {
+                        // TODO: Retrieve delay from ExternalStorageService that can check
+                        // transcoding status
+                        return SystemProperties.getInt("sys.fuse.transcode_anr_delay_ms", 0);
+                    });
+        }
     }
 
     /**