Remove Commit and Redraw In SurfaceLayer::SetFallbackSurfaceId

Fallback SurfaceIds are no longer needed for SurfaceReferences thus
this CL removes the fix for https://crbug.com/827242


Bug: 874138
Cq-Include-Trybots: luci.chromium.try:android_optional_gpu_tests_rel;master.tryserver.blink:linux_trusty_blink_rel
Change-Id: I400fb64a69d4395f7463634db87b957ff7005788
Reviewed-on: https://chromium-review.googlesource.com/1174916Reviewed-by: Fady Samuel <fsamuel@chromium.org>
Reviewed-by: Saman Sami <samans@chromium.org>
Commit-Queue: Andre Kaba <akaba@google.com>
Cr-Commit-Position: refs/heads/master@{#583917}

cc/layers/surface_layer.cc

@@ -68,15 +68,8 @@ void SurfaceLayer::SetPrimarySurfaceId(const viz::SurfaceId& surface_id,
 }
 
 void SurfaceLayer::SetFallbackSurfaceId(const viz::SurfaceId& surface_id) {
-  if (surface_range_.start() == surface_id) {
-    // TODO(samans): This was added to fix https://crbug.com/827242. Remove this
-    // once fallback SurfaceIds aren't tied to SurfaceReferences, and
-    // viz::Display can handle missing fallbacks. https://crbug.com/857575
-    if (layer_tree_host())
-      layer_tree_host()->SetNeedsCommitWithForcedRedraw();
+  if (surface_range_.start() == surface_id)
     return;
-  }
-
   TRACE_EVENT_WITH_FLOW2(
       TRACE_DISABLED_BY_DEFAULT("viz.surface_id_flow"),
       "LocalSurfaceId.Submission.Flow",