Fix crash in GLES2DecoderPassthroughImpl::Destroy

Bug: 857038
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: Id5564ce088b602a7284c7660b560c5529a1e820e
Reviewed-on: https://chromium-review.googlesource.com/1117440Reviewed-by: Antoine Labour <piman@chromium.org>
Commit-Queue: Ted Meyer <tmathmeyer@chromium.org>
Cr-Commit-Position: refs/heads/master@{#570984}

gpu/command_buffer/service/gles2_cmd_decoder_passthrough.cc

@@ -911,13 +911,15 @@ void GLES2DecoderPassthroughImpl::Destroy(bool have_context) {
     }
   }
 
-  for (PassthroughAbstractTextureImpl* iter : abstract_textures_) {
-    resources_->textures_pending_destruction.insert(
-        iter->OnDecoderWillDestroy());
-  }
-  abstract_textures_.clear();
-  if (have_context) {
-    resources_->DestroyPendingTextures(/*has_context=*/true);
+  if (resources_) {  // Initialize may not have been called yet.
+    for (PassthroughAbstractTextureImpl* iter : abstract_textures_) {
+      resources_->textures_pending_destruction.insert(
+          iter->OnDecoderWillDestroy());
+    }
+    abstract_textures_.clear();
+    if (have_context) {
+      resources_->DestroyPendingTextures(/*has_context=*/true);
+    }
   }
 
   DeleteServiceObjects(&framebuffer_id_map_, have_context,