Allow target arch in tapas parameters.

For example:
$ tapas App1 App2 x86 userdebug

Change-Id: I19601a93484f70dac677d2d68033684db32e1321

envsetup.sh

@@ -1,6 +1,8 @@
 function hmm() {
 cat <<EOF
 Invoke ". build/envsetup.sh" from your shell to add the following functions to your environment:
+- lunch:   lunch <product_name>-<build_variant>
+- tapas:   tapas [<App1> <App2> ...] [arm|x86|mips] [eng|userdebug|user]
 - croot:   Changes directory to the top of the tree.
 - m:       Makes from the top of the tree.
 - mm:      Builds all of the modules in the current directory.
@@ -532,13 +534,24 @@ complete -F _lunch lunch
 # Run tapas with one ore more app names (from LOCAL_PACKAGE_NAME)
 function tapas()
 {
+    local arch=$(echo -n $(echo $* | xargs -n 1 echo | \grep -E '^(arm|x86|mips)$'))
     local variant=$(echo -n $(echo $* | xargs -n 1 echo | \grep -E '^(user|userdebug|eng)$'))
-    local apps=$(echo -n $(echo $* | xargs -n 1 echo | \grep -E -v '^(user|userdebug|eng)$'))
+    local apps=$(echo -n $(echo $* | xargs -n 1 echo | \grep -E -v '^(user|userdebug|eng|arm|x86|mips)$'))
 
+    if [ $(echo $arch | wc -w) -gt 1 ]; then
+        echo "tapas: Error: Multiple build archs supplied: $arch"
+        return
+    fi
     if [ $(echo $variant | wc -w) -gt 1 ]; then
         echo "tapas: Error: Multiple build variants supplied: $variant"
         return
     fi
+
+    local product=full
+    case $arch in
+      x86)   product=full_x86;;
+      mips)  product=full_mips;;
+    esac
     if [ -z "$variant" ]; then
         variant=eng
     fi
@@ -546,7 +559,7 @@ function tapas()
         apps=all
     fi
 
-    export TARGET_PRODUCT=full
+    export TARGET_PRODUCT=$product
     export TARGET_BUILD_VARIANT=$variant
     export TARGET_BUILD_TYPE=release
     export TARGET_BUILD_APPS=$apps