Add android tools to v8's deps.

DEPS

Index: DEPS
diff --git a/DEPS b/DEPS
index 9459204f2cb6054d9114dba86c9463bbc610a6ed..d4139c6098545b55536b12c8bdaa211e672f8e6c 100644
--- a/DEPS
+++ b/DEPS
@@ -3,6 +3,8 @@
 # all paths in here must match this assumption.
 
 vars = {
+  "chromium_git": "https://chromium.googlesource.com",
+
   "chromium_trunk": "https://src.chromium.org/svn/trunk",
 
   "buildtools_revision": "fb782d4369d5ae04f17a2fceef7de5a63e50f07b",
@@ -28,6 +30,11 @@ deps = {
 }
 
 deps_os = {
+  "android": {
+    "v8/third_party/android_tools":
+      Var("chromium_git") + "/android_tools.git" + "@" +
+          "31869996507de16812bb53a3d0aaa15cd6194c16",
+  },
   "win": {
     "v8/third_party/cygwin":
       Var("chromium_trunk") + "/deps/third_party/cygwin@66844",