Add empty incompatibilities baseline files.

They are new implicit dependencies of sdk_library.

Bug: 180123247
Test: TreeHugger
Change-Id: Ida166ba3d38e52de986f96335a540a68e3bf0ffb
diff --git a/android_icu4j/Android.bp b/android_icu4j/Android.bp
index 41eba87..aa7bb2f 100644
--- a/android_icu4j/Android.bp
+++ b/android_icu4j/Android.bp
@@ -242,6 +242,14 @@
     ],
 }
 
+// Referenced implicitly from i18n.module.intra.core.api.
+filegroup {
+    name: "i18n.module.intra.core.api-incompatibilities.api.public.latest",
+    srcs: [
+        "api/intra/last-incompatibilities.txt",
+    ],
+}
+
 // Referenced implicitly from legacy.i18n.module.platform.api.
 filegroup {
     name: "legacy.i18n.module.platform.api.api.public.latest",
@@ -258,6 +266,14 @@
     ],
 }
 
+// Referenced implicitly from legacy.i18n.module.platform.api.
+filegroup {
+    name: "legacy.i18n.module.platform.api-incompatibilities.api.public.latest",
+    srcs: [
+        "api/legacy_platform/last-incompatibilities.txt",
+    ],
+}
+
 // Referenced implicitly from stable.i18n.module.platform.api.
 filegroup {
     name: "stable.i18n.module.platform.api.api.public.latest",
@@ -274,6 +290,14 @@
     ],
 }
 
+// Referenced implicitly from stable.i18n.module.platform.api.
+filegroup {
+    name: "stable.i18n.module.platform.api-incompatibilities.api.public.latest",
+    srcs: [
+        "api/stable_platform/last-incompatibilities.txt",
+    ],
+}
+
 // Generates stub source files for the core platform API of the I18N module.
 // i.e. every class/member that is either in the public API or annotated with
 // @CorePlatformApi.
diff --git a/android_icu4j/api/intra/last-incompatibilities.txt b/android_icu4j/api/intra/last-incompatibilities.txt
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/android_icu4j/api/intra/last-incompatibilities.txt
diff --git a/android_icu4j/api/legacy_platform/last-incompatibilities.txt b/android_icu4j/api/legacy_platform/last-incompatibilities.txt
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/android_icu4j/api/legacy_platform/last-incompatibilities.txt
diff --git a/android_icu4j/api/stable_platform/last-incompatibilities.txt b/android_icu4j/api/stable_platform/last-incompatibilities.txt
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/android_icu4j/api/stable_platform/last-incompatibilities.txt