Install sdk extras packages using android to prompt for ToS.

build/install-build-deps-android.sh

Index: build/install-build-deps-android.sh
diff --git a/build/install-build-deps-android.sh b/build/install-build-deps-android.sh
index 1fcf4fb38b5ec9fa39ec4d6a4a51c25983549b7e..cb642d00b5dbab5f1e5717fe7fe0ec7be4bdab9e 100755
--- a/build/install-build-deps-android.sh
+++ b/build/install-build-deps-android.sh
@@ -84,4 +84,17 @@ then
   fi
 fi
 
+# Get the SDK extras packages to install from the DEPS file 'sdkextras' hook.
+packages="$(python -c 'execfile("./get_sdk_extras_packages.py"); \
+            execfile("./../DEPS"); get_sdk_extras(hooks)')"
+for package in "${packages}"; do
+  package_num=$(../third_party/android_tools/sdk/tools/android list sdk \
+                | grep -i "$package," \
+                | awk '/^[ ]*[0-9]*- / {gsub("-",""); print $1}')
+  if [[ -n ${package_num} ]]; then
+    ../third_party/android_tools/sdk/tools/android update sdk --no-ui --filter \
+      ${package_num}
+  fi
+done
+
 echo "install-build-deps-android.sh complete."