Add res folder to multidex SDK projects.

This will fix an error when importing thoses projects with ADT.

(cherry picked from commit 6fa1156b3b98e72952e1281b66af9867205e1954)

Change-Id: Ibcd570a3f4f3bd6c8c4fd263d2d18e2cec18b787
diff --git a/build/sdk.atree b/build/sdk.atree
index 9c0aac2..8e957fc 100644
--- a/build/sdk.atree
+++ b/build/sdk.atree
@@ -371,6 +371,7 @@
 frameworks/support/multidex/library/AndroidManifest.xml                                                   extras/android/support/multidex/library/AndroidManifest.xml
 frameworks/support/multidex/library/project.properties                                                    extras/android/support/multidex/library/project.properties
 frameworks/support/multidex/library/src/.readme                                                           extras/android/support/multidex/library/src/.readme
+frameworks/support/multidex/library/res/.readme                                                           extras/android/support/multidex/library/res/.readme
 ${OUT_DIR}/target/common/obj/PACKAGING/android-support-multidex_intermediates/android-support-multidex.jar              extras/android/support/multidex/library/libs/android-support-multidex.jar
 
 frameworks/support/multidex/instrumentation/README.txt                                                         extras/android/support/multidex/instrumentation/README.txt
@@ -379,6 +380,7 @@
 frameworks/support/multidex/instrumentation/AndroidManifest.xml                                                extras/android/support/multidex/instrumentation/AndroidManifest.xml
 frameworks/support/multidex/instrumentation/project.properties                                                 extras/android/support/multidex/instrumentation/project.properties
 frameworks/support/multidex/instrumentation/src/.readme                                                        extras/android/support/multidex/instrumentation/src/.readme
+frameworks/support/multidex/instrumentation/res/.readme                                                        extras/android/support/multidex/instrumentation/res/.readme
 ${OUT_DIR}/target/common/obj/PACKAGING/android-support-multidex-instrumentation_intermediates/android-support-multidex-instrumentation.jar      extras/android/support/multidex/instrumentation/libs/android-support-multidex-instrumentation.jar
 ${OUT_DIR}/target/common/obj/PACKAGING/android-support-multidex_intermediates/android-support-multidex.jar                                      extras/android/support/multidex/instrumentation/libs/android-support-multidex.jar