Let android_gyp pass extra parameters to gyp

This is useful for example
android_gyp --help
or
android_gyp --format=dump_dependency_json (to generate a dependency graph).

BUG=none
TEST=Run android_gyp --help


Review URL: https://chromiumcodereview.appspot.com/10381043

git-svn-id: http://src.chromium.org/svn/trunk/src/build@135746 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

android/envsetup.sh

@@ -107,7 +107,7 @@ android_gyp() {
   CXX_target=$(basename ${ANDROID_TOOLCHAIN}/*-g++) \
   LINK_target=$(basename ${ANDROID_TOOLCHAIN}/*-gcc) \
   AR_target=$(basename ${ANDROID_TOOLCHAIN}/*-ar) \
-  "${CHROME_SRC}/build/gyp_chromium" --depth="${CHROME_SRC}"
+  "${CHROME_SRC}/build/gyp_chromium" --depth="${CHROME_SRC}" "$@"
 }
 
 export OBJCOPY=$(echo ${ANDROID_TOOLCHAIN}/*-objcopy)