Defer media loading while on cellular networks.

third_party/WebKit/LayoutTests/media/video-preload-cellular-test.js

Index: third_party/WebKit/LayoutTests/media/video-preload-cellular-test.js
diff --git a/third_party/WebKit/LayoutTests/media/video-preload-cellular-test.js b/third_party/WebKit/LayoutTests/media/video-preload-cellular-test.js
new file mode 100644
index 0000000000000000000000000000000000000000..202f4b0ab64d934d4b0f55cd2e4c8ccdb1a57e50
--- /dev/null
+++ b/third_party/WebKit/LayoutTests/media/video-preload-cellular-test.js
@@ -0,0 +1,16 @@
+function cellular_preload_test() {
+  async_test(function(t) {
+    internals.setNetworkStateNotifierTestOnly(true);
+    internals.setNetworkConnectionInfo('cellular', 2.0);
+
+    var video = document.querySelector('video');
+    assert_equals(video.preload, 'none')
+    video.src = 'resources/test-positive-start-time.webm';
+
+    video.onsuspend = t.step_func_done();
+    video.onprogress = t.unreached_func();
+    t.add_cleanup(function() {
+      internals.setNetworkStateNotifierTestOnly(false);
+    });
+  });
+}