Mojo: Add support for the use_mojo gyp define to mojob.sh.

mojo/tools/mojob.sh

Index: mojo/tools/mojob.sh
diff --git a/mojo/tools/mojob.sh b/mojo/tools/mojob.sh
index 2f72092d1bdde426de45c0c606cf55c0927098d6..7d887e703fa4c7130733050bdb191b1037296863 100755
--- a/mojo/tools/mojob.sh
+++ b/mojo/tools/mojob.sh
@@ -35,6 +35,9 @@ option (which will only apply to following commands) should be one of:
   Component options:
     --shared Build components as shared libraries (default).
     --static Build components as static libraries.
+  Mojo in chromium/content (crbug.com/353602):
+    --use-mojo - Enabled (default).
+    --no-use-mojo - Disabled.
 
 Note: It will abort on the first failure (if any).
 EOF
@@ -87,6 +90,9 @@ should_do_Release() {
 COMPILER=clang
 # Valid values: shared or static.
 COMPONENT=shared
+# TODO(vtl): Remove this. crbug.com/353602
+# Valid values: enabled or disabled.
+USE_MOJO=enabled
 make_gyp_defines() {
   local options=()
   # Always include these options.
@@ -107,6 +113,14 @@ make_gyp_defines() {
       options+=("component=static_library")
       ;;
   esac
+  case "$USE_MOJO" in
+    enabled)
+      options+=("use_mojo=1")
+      ;;
+    disabled)
+      options+=("use_mojo=0")
+      ;;
+  esac
   echo ${options[*]}
 }
 
@@ -174,6 +188,12 @@ for arg in "$@"; do
     --static)
       COMPONENT=static
       ;;
+    --use-mojo)
+      USE_MOJO=enabled
+      ;;
+    --no-use-mojo)
+      USE_MOJO=disabled
+      ;;
     *)
       echo "Unknown command \"${arg}\". Try \"$(basename "$0") help\"."
       exit 1