Add config to disable Bubbles

Some platforms like ARC doesn't support Bubbles for now, and they
need a way to disable the feature platform-wide without any
code divergence from upstream.

Bug: 138677613
Test: Manually confirmed bubbles didn't appear anymore in ARC.
Change-Id: I59c30f75e0e2013aa23aa7221aa69310e2c66774

core/res/res/values/config.xml

@@ -3804,6 +3804,9 @@
     <!-- True if the device supports running activities on secondary displays. -->
     <bool name="config_supportsMultiDisplay">true</bool>
 
+    <!-- Indicates whether the device supports bubble notifications or not. -->
+    <bool name="config_supportsBubble">true</bool>
+
     <!-- True if the device has no home screen. That is a launcher activity
          where the user can launch other applications from.  -->
     <bool name="config_noHomeScreen">false</bool>

core/res/res/values/symbols.xml

@@ -379,6 +379,7 @@
   <java-symbol type="bool" name="config_supportSpeakerNearUltrasound" />
   <java-symbol type="bool" name="config_supportAudioSourceUnprocessed" />
   <java-symbol type="bool" name="config_freeformWindowManagement" />
+  <java-symbol type="bool" name="config_supportsBubble" />
   <java-symbol type="bool" name="config_supportsMultiWindow" />
   <java-symbol type="bool" name="config_supportsSplitScreenMultiWindow" />
   <java-symbol type="bool" name="config_supportsMultiDisplay" />

services/core/java/com/android/server/notification/BubbleExtractor.java

@@ -32,6 +32,7 @@ import android.app.PendingIntent;
 import android.content.Context;
 import android.content.Intent;
 import android.content.pm.ActivityInfo;
+import android.content.res.Resources;
 import android.util.Slog;
 
 import com.android.internal.annotations.VisibleForTesting;
@@ -49,10 +50,15 @@ public class BubbleExtractor implements NotificationSignalExtractor {
     private ActivityManager mActivityManager;
     private Context mContext;
 
+    boolean mSupportsBubble;
+
     public void initialize(Context context, NotificationUsageStats usageStats) {
         if (DBG) Slog.d(TAG, "Initializing  " + getClass().getSimpleName() + ".");
         mContext = context;
         mActivityManager = (ActivityManager) mContext.getSystemService(Context.ACTIVITY_SERVICE);
+
+        mSupportsBubble = Resources.getSystem().getBoolean(
+                com.android.internal.R.bool.config_supportsBubble);
     }
 
     public RankingReconsideration process(NotificationRecord record) {
@@ -138,6 +144,10 @@ public class BubbleExtractor implements NotificationSignalExtractor {
      */
     @VisibleForTesting
     boolean canPresentAsBubble(NotificationRecord r) {
+        if (!mSupportsBubble) {
+            return false;
+        }
+
         Notification notification = r.getNotification();
         Notification.BubbleMetadata metadata = notification.getBubbleMetadata();
         String pkg = r.getSbn().getPackageName();