Bug 1608302: Part 1 - Modify service definitions to support multiple content processes; r=geckoview-reviewers,snorp

For testing purposes, we'll only support 3 at the moment.

Note that this does not materially affect our test builds, as e10s-multi is
still govered by the `dom.ipc.processCount` Gecko pref.

Differential Revision: https://phabricator.services.mozilla.com/D65639

--HG--
extra : moz-landing-system : lando

mobile/android/geckoview/src/main/AndroidManifest.xml

@@ -56,11 +56,25 @@
                 android:process=":gmplugin">
         </service>
         <service
-                android:name="org.mozilla.gecko.process.GeckoChildProcessServices$tab"
+                android:name="org.mozilla.gecko.process.GeckoChildProcessServices$tab0"
                 android:enabled="true"
                 android:exported="false"
                 android:isolatedProcess="false"
-                android:process=":tab">
+                android:process=":tab0">
+        </service>
+        <service
+                android:name="org.mozilla.gecko.process.GeckoChildProcessServices$tab1"
+                android:enabled="true"
+                android:exported="false"
+                android:isolatedProcess="false"
+                android:process=":tab1">
+        </service>
+        <service
+                android:name="org.mozilla.gecko.process.GeckoChildProcessServices$tab2"
+                android:enabled="true"
+                android:exported="false"
+                android:isolatedProcess="false"
+                android:process=":tab2">
         </service>
         <service
                 android:name="org.mozilla.gecko.process.GeckoChildProcessServices$socket"

mobile/android/geckoview/src/main/java/org/mozilla/gecko/process/GeckoChildProcessServices.java

@@ -7,6 +7,9 @@ package org.mozilla.gecko.process;
 
 public class GeckoChildProcessServices {
     public static final class gmplugin extends GeckoServiceChildProcess {}
-    public static final class tab extends GeckoServiceChildProcess {}
     public static final class socket extends GeckoServiceChildProcess {}
+
+    public static final class tab0 extends GeckoServiceChildProcess {}
+    public static final class tab1 extends GeckoServiceChildProcess {}
+    public static final class tab2 extends GeckoServiceChildProcess {}
 }