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Also includes a refactoring of the Ant xml scripts to use a common template (contributed by shashishekhar@chromium.org). As part of this, I also continued Torne's effort of removing our reliance on environment variables. Unfortunately this currently means that you have to specify 5 gyp flags:
    ANDROID_SDK, ANDROID_SDK_ROOT, ANDROID_SDK_TOOLS, ANDROID_SDK_VERSION, ANDROID_TOOLCHAIN.

This'll get better as we make further use of the checked in sdk both upstream and downstream. The problem stems from the android tree and released sdk having different configurations.

Review URL: https://chromiumcodereview.appspot.com/10830012

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@150172 0039d316-1c4b-4281-b951-d872f2087c98