Add IdlClass to the embedded default android tools repository and rearrange
BuildJar's JarHelper so that it too can be embedded.

--
MOS_MIGRATED_REVID=104539260

src/BUILD

diff --git a/src/BUILD b/src/BUILD
index 8076a73..c53de4c 100644
--- a/src/BUILD
+++ b/src/BUILD
@@ -66,7 +66,9 @@
     srcs = [
         "//tools:srcs",
         "//third_party:srcs",
+        "//src/java_tools/buildjar/java/com/google/devtools/build/buildjar/jarhelper:srcs",
         "//src/tools/android/java/com/google/devtools/build/android:srcs",
+        "//src/tools/android/java/com/google/devtools/build/android/idlclass:srcs",
         "//src/tools/android/java/com/google/devtools/build/android/incrementaldeployment:srcs",
         "//src/tools/android/java/com/google/devtools/build/android/ziputils:srcs",
         "//src/main/protobuf:srcs",