Show the timeline and overflow menu before preload

This CL changes the CSS to show the timeline and overflow button before
preload on the modern media controls. This exposes the download button
so that the user can download a video without preloading.

Bug: 814509
Change-Id: I7993204dc6d0bc38ef77e18a14ae1cfa07ab3ca8
Reviewed-on: https://chromium-review.googlesource.com/930334Reviewed-by: Becca Hughes <beccahughes@chromium.org>
Reviewed-by: Mounir Lamouri <mlamouri@chromium.org>
Commit-Queue: Tommy Steimel <steimel@chromium.org>
Cr-Commit-Position: refs/heads/master@{#544103}

third_party/WebKit/Source/modules/media_controls/resources/modernMediaControls.css

@@ -625,9 +625,15 @@ video::-webkit-media-controls.audio-only [pseudo="-internal-media-controls-overf
   background: #F1F3F4;
 }
 
+.state-no-metadata input[pseudo="-webkit-media-controls-timeline" i]::-webkit-slider-thumb,
+.state-no-metadata div[pseudo="-webkit-media-controls-current-time-display" i] {
+  display: none;
+}
+
+
 .state-no-source input[pseudo="-webkit-media-controls-overlay-play-button" i],
-.use-default-poster div[pseudo="-internal-media-controls-button-panel" i],
-.use-default-poster input[pseudo="-webkit-media-controls-timeline" i] {
+.state-no-source div[pseudo="-internal-media-controls-button-panel" i],
+video::-webkit-media-controls.state-no-source input[pseudo="-webkit-media-controls-timeline" i] {
   visibility: hidden;
 }