Delete old GrContext resources in ScheduleGrContextCleanup.

Bug: 883507
Cq-Include-Trybots: luci.chromium.try:android_optional_gpu_tests_rel;luci.chromium.try:linux_optional_gpu_tests_rel;luci.chromium.try:mac_optional_gpu_tests_rel;luci.chromium.try:win_optional_gpu_tests_rel
Change-Id: I0918e4b87265acc7367f07e3f7b95c4d8d67851c
Reviewed-on: https://chromium-review.googlesource.com/1224676Reviewed-by: Eric Karl <ericrk@chromium.org>
Commit-Queue: Brian Salomon <bsalomon@google.com>
Cr-Commit-Position: refs/heads/master@{#591926}

gpu/command_buffer/service/gr_cache_controller.cc

@@ -4,6 +4,8 @@
 
 #include "gpu/command_buffer/service/gr_cache_controller.h"
 
+#include <chrono>
+
 #include "gpu/command_buffer/service/raster_decoder_context_state.h"
 #include "ui/gl/gl_context.h"
 
@@ -27,6 +29,14 @@ void GrCacheController::ScheduleGrContextCleanup() {
   if (!purge_gr_cache_cb_.IsCancelled())
     return;
 
+  constexpr int kOldResourceCleanupDelaySeconds = 30;
+  // Here we ask GrContext to free any resources that haven't been used in
+  // a long while even if it is under budget. Below we set a call back to
+  // purge all possible GrContext resources if the context itself is not being
+  // used.
+  context_state_->gr_context->performDeferredCleanup(
+      std::chrono::seconds(kOldResourceCleanupDelaySeconds));
+
   constexpr int kIdleCleanupDelaySeconds = 1;
   purge_gr_cache_cb_.Reset(base::BindOnce(&GrCacheController::PurgeGrCache,
                                           base::Unretained(this),