Only install the API level needed.

build/install-build-deps-android-sdk.sh

 #!/bin/bash
 
 # Copyright (c) 2012 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.
 
 set -e
 
 # The script is to install Android SDK, NDK for build chromium on Android, and
 # doesn't need to run as root.
@@ skipping 100 matching lines @@
   SDK_VER=$(sed '/^\#/d' ${ANDROID_SDK_ROOT}/tools/source.properties | \
       grep 'Pkg.Revision' |tail -n 1 | cut -d "=" -f2- | \
       sed 's/^[[:space:]]*//;s/[[:space:]]*$//')
   if [[ ${SDK_VER} -lt 17 ]]; then
     update_flag=" -o "
   else
     update_flag=" --all "
   fi
   # Updates the SDK to latest version firstly.
     "${ANDROID_SDK_ROOT}"/tools/android update sdk ${update_flag} --no-ui \
-        --filter platform,platform-tool,tool,system-image
+        --filter platform-tool,tool,system-image,${SDK_TARGET_ID}
 fi
 
 # Create a Android Virtual Device named 'buildbot' with default hardware
 # configuration and override the existing one, since there is no easy way to
 # check whether current AVD has correct configuration and it takes almost no
 # time to create a new one.
 "${ANDROID_SDK_ROOT}/tools/android" --silent create avd --name buildbot \
   --target ${SDK_TARGET_ID} --force <<< "no"
 
 # Install Android NDK if it doesn't exist.
@@ skipping 30 matching lines @@
       if [[ ! -f "$linker_dirname/$NEW_LINKER" ]]; then
         echo "Could not copy linker"
         exit 1
       fi
     fi
   fi
 }
 
 replace_linker $LINKER_DIRNAME_1 $LINKER_BASENAME_1
 replace_linker $LINKER_DIRNAME_2 $LINKER_BASENAME_2