Add test jar generation logic for ant builds.

build/android/ant/common.xml

Index: build/android/ant/common.xml
diff --git a/build/android/ant/common.xml b/build/android/ant/common.xml
index ff88fd06840d01c5a0c079330838445f5b376ca1..2e9301dde7dc57db43c7ef92ce6b881685f3eca5 100644
--- a/build/android/ant/common.xml
+++ b/build/android/ant/common.xml
@@ -75,4 +75,15 @@
   <property-value name="target" value="android-${ANDROID_SDK_VERSION}"/>
   <property name="source.dir" location="src"/>
   <property-location name="android.gdbserver" location="${ANDROID_GDBSERVER}"/>
+  <!-- Common directories used by SDK Build, when making changes here
+       make sure to update gyp files and test scripts constants in
+       build/android/pylib/constants.py
+  -->
+  <!-- Common directory for chromium_*.jars. -->
+  <property-location name="lib.java.dir" location="${PRODUCT_DIR}/lib.java" />
+  <!-- Common directory for test jars. -->
+  <property-location name="test.lib.java.dir" location="${PRODUCT_DIR}/test.lib.java"
+  />
+  <!-- Common directory for apks. -->
+  <property-location name="apks.dir" location="${PRODUCT_DIR}/apks" />
 </project>