Bump min SDK version to 10.9 and suppress deprecation warnings

This implies using a modern C++ library (libc++) which can use C++11
features we rely on for cross compiling to Android. This suppresses
deprecation warnings in base and skia as those libraries need to work
in environments that target a min sdk version of 10.6.

R=cstout@chromium.org, tonyg@chromium.org

Review URL: https://codereview.chromium.org/1318153005 .
diff --git a/BUILD.gn b/BUILD.gn
index a3e4bf8..6f8bbd0 100644
--- a/BUILD.gn
+++ b/BUILD.gn
@@ -21,13 +21,12 @@
     "//ui/events:events_unittests",
   ]
 
-  if (!is_android) {
-    deps += [ "//tools/xdisplaycheck" ]
-  }
-
   if (is_linux) {
-    deps += [ "//sandbox/linux:sandbox" ]
-    deps += [ "//sandbox/linux:sandbox_linux_unittests" ]
+    deps += [
+      "//sandbox/linux:sandbox",
+      "//sandbox/linux:sandbox_linux_unittests",
+      "//tools/xdisplaycheck",
+    ]
   }
 
   if (use_ozone) {