Quick hack to fix Android build
Quick hack to fix Android build

ANDROID_SDK_ROOT now required to build.  This should be handled
better, but this is a quick fix for now.
Review URL: https://codereview.appspot.com/6353093

git-svn-id: 32fc27f4dcfb6c0385cd9719852b95fe6680452d@4570 2bbb7eff-a529-9590-31e7-b0007b416f81

google/skia-buildbot,google/skia-buildbot,Tiger66639/skia-buildbot,Tiger66639/skia-buildbot,Tiger66639/skia-buildbot,google/skia-buildbot,Tiger66639/skia-buildbot,google/skia-buildbot,Tiger66639/skia-buildbot,Tiger66639/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,Tiger66639/skia-buildbot,google/skia-buildbot