Initial commit.

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diff --git a/www-client/chromium/files/chromium-serviceworker-83.patch b/www-client/chromium/files/chromium-serviceworker-83.patch
new file mode 100644
index 0000000..a836e7f
--- /dev/null
+++ b/www-client/chromium/files/chromium-serviceworker-83.patch
@@ -0,0 +1,130 @@
+From 0914a38252f205fc04fa50e858b24fa5f535ab11 Mon Sep 17 00:00:00 2001
+From: Hiroki Nakagawa <nhiroki@chromium.org>
+Date: Wed, 29 Apr 2020 11:46:54 +0900
+Subject: [PATCH] ServiceWorker: Avoid double destruction of ServiceWorkerObjectHost on connection error
+
+This CL avoids the case where ServiceWorkerObjectHost is destroyed twice
+on ServiceWorkerObjectHost::OnConnectionError() when Chromium is built
+with the GCC build toolchain.
+
+> How does the issue happen?
+
+ServiceWorkerObjectHost has a cyclic reference like this:
+
+ServiceWorkerObjectHost
+  --([1] scoped_refptr)--> ServiceWorkerVersion
+    --([2] std::unique_ptr)--> ServiceWorkerProviderHost
+      --([3] std::unique_ptr)--> ServiceWorkerContainerHost
+        --([4] std::unique_ptr)--> ServiceWorkerObjectHost
+
+Note that ServiceWorkerContainerHost manages ServiceWorkerObjectHost in
+map<int64_t version_id, std::unique_ptr<ServiceWorkerObjectHost>>.
+
+When ServiceWorkerObjectHost::OnConnectionError() is called, the
+function removes the reference [4] from the map, and destroys
+ServiceWorkerObjectHost. If the object host has the last reference [1]
+to ServiceWorkerVersion, the destruction also cuts off the references
+[2] and [3], and destroys ServiceWorkerProviderHost and
+ServiceWorkerContainerHost.
+
+This seems to work well on the Chromium's default toolchain, but not
+work on the GCC toolchain. According to the report, destruction of
+ServiceWorkerContainerHost happens while the map owned by the container
+host is erasing the ServiceWorkerObjectHost, and this results in crash
+due to double destruction of the object host.
+
+I don't know the reason why this happens only on the GCC toolchain, but
+I suspect the order of object destruction on std::map::erase() could be
+different depending on the toolchains.
+
+> How does this CL fix this?
+
+The ideal fix is to redesign the ownership model of
+ServiceWorkerVersion, but it's not feasible in the short term.
+
+Instead, this CL avoids destruction of ServiceWorkerObjectHost on
+std::map::erase(). The new code takes the ownership of the object host
+from the map first, and then erases the entry from the map. This
+separates timings to erase the map entry and to destroy the object host,
+so the crash should no longer happen.
+
+Bug: 1056598
+Change-Id: Id30654cb575bc557c42044d6f0c6f1f9bfaed613
+---
+
+diff --git a/content/browser/service_worker/service_worker_container_host.cc b/content/browser/service_worker/service_worker_container_host.cc
+index c631bcd..ff917f8 100644
+--- a/content/browser/service_worker/service_worker_container_host.cc
++++ b/content/browser/service_worker/service_worker_container_host.cc
+@@ -717,6 +717,16 @@
+     int64_t version_id) {
+   DCHECK_CURRENTLY_ON(ServiceWorkerContext::GetCoreThreadId());
+   DCHECK(base::Contains(service_worker_object_hosts_, version_id));
++
++  // ServiceWorkerObjectHost to be deleted may have the last reference to
++  // ServiceWorkerVersion that indirectly owns this ServiceWorkerContainerHost.
++  // If we erase the object host directly from the map, |this| could be deleted
++  // during the map operation and may crash. To avoid the case, we take the
++  // ownership of the object host from the map first, and then erase the entry
++  // from the map. See https://crbug.com/1056598 for details.
++  std::unique_ptr<ServiceWorkerObjectHost> to_be_deleted =
++      std::move(service_worker_object_hosts_[version_id]);
++  DCHECK(to_be_deleted);
+   service_worker_object_hosts_.erase(version_id);
+ }
+ 
+diff --git a/content/browser/service_worker/service_worker_object_host_unittest.cc b/content/browser/service_worker/service_worker_object_host_unittest.cc
+index 238cb8b..f60c7a2 100644
+--- a/content/browser/service_worker/service_worker_object_host_unittest.cc
++++ b/content/browser/service_worker/service_worker_object_host_unittest.cc
+@@ -200,6 +200,19 @@
+     return registration_info;
+   }
+ 
++  void CallOnConnectionError(ServiceWorkerContainerHost* container_host,
++                             int64_t version_id) {
++    // ServiceWorkerObjectHost has the last reference to the version.
++    ServiceWorkerObjectHost* object_host =
++        GetServiceWorkerObjectHost(container_host, version_id);
++    EXPECT_TRUE(object_host->version_->HasOneRef());
++
++    // Make sure that OnConnectionError induces destruction of the version and
++    // the object host.
++    object_host->receivers_.Clear();
++    object_host->OnConnectionError();
++  }
++
+   BrowserTaskEnvironment task_environment_;
+   std::unique_ptr<EmbeddedWorkerTestHelper> helper_;
+   scoped_refptr<ServiceWorkerRegistration> registration_;
+@@ -409,5 +422,30 @@
+             events[0]->source_info_for_client->client_type);
+ }
+ 
++// This is a regression test for https://crbug.com/1056598.
++TEST_F(ServiceWorkerObjectHostTest, OnConnectionError) {
++  const GURL scope("https://www.example.com/");
++  const GURL script_url("https://www.example.com/service_worker.js");
++  Initialize(std::make_unique<EmbeddedWorkerTestHelper>(base::FilePath()));
++  SetUpRegistration(scope, script_url);
++
++  // Create the provider host.
++  ASSERT_EQ(blink::ServiceWorkerStatusCode::kOk,
++            StartServiceWorker(version_.get()));
++
++  // Set up the case where the last reference to the version is owned by the
++  // service worker object host.
++  ServiceWorkerContainerHost* container_host =
++      version_->provider_host()->container_host();
++  ServiceWorkerVersion* version_rawptr = version_.get();
++  version_ = nullptr;
++  ASSERT_TRUE(version_rawptr->HasOneRef());
++
++  // Simulate the connection error that induces the object host destruction.
++  // This shouldn't crash.
++  CallOnConnectionError(container_host, version_rawptr->version_id());
++  base::RunLoop().RunUntilIdle();
++}
++
+ }  // namespace service_worker_object_host_unittest
+ }  // namespace content