[Reland] Temporarily disable context-clear on background for low-end Android

This optimization was added in M61, but was causing flicker on app
resume. We'll re-enable it once a fix for that issue has landed.

TBR=piman

Bug: 792120
Change-Id: I7d0ddc96b56a2e99f39ef160f175b79ec466531b
Cq-Include-Trybots: master.tryserver.chromium.android:android_optional_gpu_tests_rel;master.tryserver.chromium.linux:linux_optional_gpu_tests_rel;master.tryserver.chromium.mac:mac_optional_gpu_tests_rel;master.tryserver.chromium.win:win_optional_gpu_tests_rel
Reviewed-on: https://chromium-review.googlesource.com/854740Reviewed-by: Antoine Labour <piman@chromium.org>
Reviewed-by: Maria Khomenko <mariakhomenko@chromium.org>
Commit-Queue: Eric Karl <ericrk@chromium.org>
Cr-Original-Commit-Position: refs/heads/master@{#527748}
Reviewed-on: https://chromium-review.googlesource.com/944193Reviewed-by: Eric Karl <ericrk@chromium.org>
Cr-Commit-Position: refs/heads/master@{#540384}

gpu/ipc/service/gpu_channel_manager.cc

@@ -266,6 +266,10 @@ void GpuChannelManager::DoWakeUpGpu() {
 
 void GpuChannelManager::OnApplicationStateChange(
     base::android::ApplicationState state) {
+  // TODO(ericrk): Temporarily disable the context release logic due to
+  // https://crbug.com/792120. Re-enable when the fix lands.
+  return;
+
   if (state != base::android::APPLICATION_STATE_HAS_STOPPED_ACTIVITIES ||
       !is_running_on_low_end_mode_) {
     return;