[Chromecast] Disable background video suspend

Bug: internal b/151166224
Test: cast video on Smart Display
Change-Id: I50fafbac4dab0c01b9679c3eb5e25074a00cdc46
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2145870
Commit-Queue: Sandeep Vijayasekar <sandv@google.com>
Auto-Submit: Sandeep Vijayasekar <sandv@google.com>
Reviewed-by: Yuchen Liu <yucliu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#758331}

chromecast/renderer/cast_media_playback_options.cc

@@ -24,6 +24,8 @@ CastMediaPlaybackOptions::CastMediaPlaybackOptions(
   // Override default content MediaPlaybackOptions
   renderer_media_playback_options_
       .is_background_video_track_optimization_supported = false;
+  renderer_media_playback_options_
+      .is_background_suspend_enabled = false;
   render_frame->SetRenderFrameMediaPlaybackOptions(
       renderer_media_playback_options_);