Specify the exact project to build

third_party/closure_compiler/roll_closure_compiler

 #!/bin/bash
 # Copyright 2014 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 #
 # Download the newest version of Closure Compiler, build it and put into Chrome
 # source tree. Also update externs/chrome_extensions.js.
 
 readonly SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
 readonly TEMP_DIR=$(mktemp -d)
@@ skipping 29 matching lines @@
   exit 0
 else
   head_range=$(cat <<EOT
 Change log:
 https://github.com/google/closure-compiler/compare/${old_head}...${new_head}
 EOT
 )
 fi
 
 echo "Building Closure Compiler"
-# TODO(dbeam): can we do less here? As in: build a more specific target.
-mvn install -DskipTests=true
+mvn install -DskipTests=true --projects com.google.javascript:closure-compiler
 
 if [[ "$?" -ne 0 ]]; then
   echo "Failed to build jar, copying nothing" >&2
   cleanup
   exit 1
 fi
 
 # TODO(dbeam): this .jar seems to be a bit bigger than the jar previously built
 # by ant. I tried many other jars in target/, but none of them were able to
 # build the runner.jar without issue.
@@ skipping 67 matching lines @@
 echo "${head_range}"
 if [[ ! -z "${extensions_range}" ]]; then echo "${extensions_range}"; fi
 if [[ ! -z "${polymer_range}" ]]; then echo "${polymer_range}"; fi
 echo
 echo "TBR="
 echo "BUG='"
 echo
 echo "git cl upload"
 
 cleanup