Add build flag for iterative vm testing.

Change-Id: Ib8258b33f87aeadfbaee145bdf7ab460af66c39f

BUG=N0ne
TEST=Ran it with --build

Review URL: http://codereview.chromium.org/6368129

bin/cros_run_vm_test

@@ -34,7 +34,8 @@ find_common_sh
 get_default_board
 
 DEFINE_string board "$DEFAULT_BOARD" \
-    "The board for which you built autotest." b
+    "The board for which you built autotest."
+DEFINE_boolean build ${FLAGS_FALSE} "Build tets while running" b
 DEFINE_string image_path "" "Full path of the VM image"
 DEFINE_string results_dir_root "" "alternate root results directory"
 DEFINE_string test_case "" "Name of the test case to run"
@@ -101,8 +102,13 @@ if [ -n "${FLAGS_verify_chrome_version}" ]; then
   fi
 fi
 
+# Set the build flag for run_remote_tests.
+BUILD_FLAG=""
+[ ${FLAGS_build}-eq ${FLAGS_true} ] && BUILD_FLAG="--build"
+
 "${SCRIPTS_DIR}/run_remote_tests.sh" \
     --board=${FLAGS_board} \
+    ${BUILD_FLAG} \
     --ssh_port=${FLAGS_ssh_port} \
     --remote=127.0.0.1 \
     --results_dir_root="${FLAGS_results_dir_root}" \