Checkpoint work to get GN builds working on Android.

build/config/android/BUILD.gn

Index: build/config/android/BUILD.gn
diff --git a/build/config/android/BUILD.gn b/build/config/android/BUILD.gn
new file mode 100644
index 0000000000000000000000000000000000000000..60a3bcd9907f5e2a85723d78a417d0a6f9da6098
--- /dev/null
+++ b/build/config/android/BUILD.gn
@@ -0,0 +1,20 @@
+# Copyright 2013 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+import("//build/config/android/config.gni")
+import("//build/config/sysroot.gni")
+
+config("sdk") {
+  if (sysroot != "") {
+    cflags = [ "--sysroot=" + sysroot ]
+    ldflags = [ "--sysroot=" + sysroot ]
+
+    # Need to get some linker flags out of the sysroot.
+    sysroot_ld_path = rebase_path("//build/config/linux/sysroot_ld_path.py")
+    ldflags += [ exec_script(sysroot_ld_path,
+        [ rebase_path("//build/linux/sysroot_ld_path.sh"), sysroot ],
+        "value")
+    ]
+  }
+}