envsetup: Unbreak android_gyp for a while.

r262292 accidentally broke android_gyp. Unbreak it for a while, by using
an env var with a long name that hopefully nobody will refer to from anywhere
in the 3-4 weeks it's going to be in the tree.

BUG=330631
NOTRY=true

Review URL: https://codereview.chromium.org/234223002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@263143 0039d316-1c4b-4281-b951-d872f2087c98

build/android/envsetup.sh

@@ -46,10 +46,12 @@ android_envsetup_main() {
   # Add Chromium Android development scripts to system path.
   # Must be after CHROME_SRC is set.
   export PATH=$PATH:${CHROME_SRC}/build/android
+
+  export ENVSETUP_GYP_CHROME_SRC=${CHROME_SRC}  # TODO(thakis): Remove.
 }
 android_envsetup_main
 
 android_gyp() {
   echo "Please call build/gyp_chromium instead. android_gyp is going away."
-  "${CHROME_SRC}/build/gyp_chromium" --depth="${CHROME_SRC}" --check "$@"
+  "${ENVSETUP_GYP_CHROME_SRC}/build/gyp_chromium" --depth="${ENVSETUP_GYP_CHROME_SRC}" --check "$@"
 }