chore: cherry-pick a0a48e0132bc from chromium

patches/chromium/.patches

@@ -100,3 +100,4 @@ move_readablestream_requests_onto_the_stack_before_iteration.patch
 streams_convert_state_dchecks_to_checks.patch
 audiocontext_haspendingactivity_unless_it_s_closed.patch
 protect_automatic_pull_handlers_with_mutex.patch
+cherry-pick-a0a48e0132bc.patch

patches/chromium/cherry-pick-a0a48e0132bc.patch

@@ -0,0 +1,44 @@
+From a0a48e0132bc04736a1ef116d89ae19eea01500d Mon Sep 17 00:00:00 2001
+From: Miguel Casas <mcasas@chromium.org>
+Date: Thu, 5 Mar 2020 19:42:53 +0000
+Subject: [PATCH] MojoVideoEncodeAcceleratorService: handle potential later
+ Initialize()
+
+This CL fixes a potential Initialize()-after-Initialize() of the said
+service, as described in the bug, following the suggestion in #c11.
+
+Bug: 1056222
+Change-Id: Idd951d3f0bee62b94382ffe80e4e6b3cef33e6d9
+Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2090031
+Commit-Queue: Miguel Casas <mcasas@chromium.org>
+Commit-Queue: Chrome Cunningham <chcunningham@chromium.org>
+Auto-Submit: Miguel Casas <mcasas@chromium.org>
+Reviewed-by: danakj <danakj@chromium.org>
+Reviewed-by: Chrome Cunningham <chcunningham@chromium.org>
+Cr-Commit-Position: refs/heads/master@{#747376}
+---
+ .../mojo/services/mojo_video_encode_accelerator_service.cc | 7 ++++++-
+ 1 file changed, 6 insertions(+), 1 deletion(-)
+
+diff --git a/media/mojo/services/mojo_video_encode_accelerator_service.cc b/media/mojo/services/mojo_video_encode_accelerator_service.cc
+index 50ade44981a1b..51d62ebbb2180 100644
+--- a/media/mojo/services/mojo_video_encode_accelerator_service.cc
++++ b/media/mojo/services/mojo_video_encode_accelerator_service.cc
+@@ -48,11 +48,16 @@ void MojoVideoEncodeAcceleratorService::Initialize(
+     InitializeCallback success_callback) {
+   DVLOG(1) << __func__ << " " << config.AsHumanReadableString();
+   DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
+-  DCHECK(!encoder_);
+   DCHECK(config.input_format == PIXEL_FORMAT_I420 ||
+          config.input_format == PIXEL_FORMAT_NV12)
+       << "Only I420 or NV12 format supported";
+
++  if (encoder_) {
++    DLOG(ERROR) << __func__ << " VEA is already initialized";
++    std::move(success_callback).Run(false);
++    return;
++  }
++
+   if (!client) {
+     DLOG(ERROR) << __func__ << "null |client|";
+     std::move(success_callback).Run(false);