Pass owners's cryptohome ID when starting Plugin VM dispatcher

The dispatcher state will reside in daemon store/cryptohome instead of
global stateful to avoid cross-user information disclosure, so it needs
to know cryptohome ID of the session owner in order to bind-mount
the right state directory.

Bug: b:143443446
Change-Id: Id29b10f2981fe9e919fe41d3e0f4c3832bde1654
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1899838Reviewed-by: Timothy Loh <timloh@chromium.org>
Reviewed-by: Steven Bennetts <stevenjb@chromium.org>
Commit-Queue: Dmitry Torokhov <dtor@chromium.org>
Cr-Commit-Position: refs/heads/master@{#713488}

chrome/browser/chromeos/plugin_vm/plugin_vm_image_manager.cc

@@ -149,6 +149,7 @@ void PluginVmImageManager::StartImport() {
   chromeos::DBusThreadManager::Get()
       ->GetDebugDaemonClient()
       ->StartPluginVmDispatcher(
+          chromeos::ProfileHelper::GetUserIdHashFromProfile(profile_),
           base::BindOnce(&PluginVmImageManager::OnPluginVmDispatcherStarted,
                          weak_ptr_factory_.GetWeakPtr()));
 }

chrome/browser/chromeos/plugin_vm/plugin_vm_manager.cc

@@ -140,8 +140,8 @@ void PluginVmManager::LaunchPluginVm() {
   chromeos::DBusThreadManager::Get()
       ->GetDebugDaemonClient()
       ->StartPluginVmDispatcher(
-          base::BindOnce(&PluginVmManager::OnStartPluginVmDispatcher,
-                         weak_ptr_factory_.GetWeakPtr()));
+          owner_id_, base::BindOnce(&PluginVmManager::OnStartPluginVmDispatcher,
+                                    weak_ptr_factory_.GetWeakPtr()));
 }
 
 void PluginVmManager::StopPluginVm() {

chromeos/dbus/debug_daemon/debug_daemon_client.cc

@@ -521,10 +521,12 @@ class DebugDaemonClientImpl : public DebugDaemonClient {
                        weak_ptr_factory_.GetWeakPtr(), std::move(callback)));
   }
 
-  void StartPluginVmDispatcher(PluginVmDispatcherCallback callback) override {
+  void StartPluginVmDispatcher(const std::string& owner_id,
+                               PluginVmDispatcherCallback callback) override {
     dbus::MethodCall method_call(debugd::kDebugdInterface,
                                  debugd::kStartVmPluginDispatcher);
     dbus::MessageWriter writer(&method_call);
+    writer.AppendString(owner_id);
     debugdaemon_proxy_->CallMethod(
         &method_call, dbus::ObjectProxy::TIMEOUT_USE_DEFAULT,
         base::BindOnce(&DebugDaemonClientImpl::OnStartPluginVmDispatcher,

chromeos/dbus/debug_daemon/debug_daemon_client.h

@@ -238,8 +238,10 @@ class COMPONENT_EXPORT(DEBUG_DAEMON) DebugDaemonClient
   // StartPluginVmDispatcher/StopPluginVmDispatcher.
   using PluginVmDispatcherCallback = base::OnceCallback<void(bool success)>;
   // Calls debugd::kStartVmPluginDispatcher, which starts the PluginVm
-  // dispatcher service. |callback| is called when the method finishes.
-  virtual void StartPluginVmDispatcher(PluginVmDispatcherCallback callback) = 0;
+  // dispatcher service on behalf of |owner_id|. |callback| is called
+  // when the method finishes.
+  virtual void StartPluginVmDispatcher(const std::string& owner_id,
+                                       PluginVmDispatcherCallback callback) = 0;
   // Calls debug::kStopVmPluginDispatcher, which stops the PluginVm dispatcher
   // service. |callback| is called when the method finishes.
   virtual void StopPluginVmDispatcher(PluginVmDispatcherCallback callback) = 0;

chromeos/dbus/debug_daemon/fake_debug_daemon_client.cc

@@ -256,6 +256,7 @@ void FakeDebugDaemonClient::StopConcierge(ConciergeCallback callback) {
 }
 
 void FakeDebugDaemonClient::StartPluginVmDispatcher(
+    const std::string& owner_id,
     PluginVmDispatcherCallback callback) {
   base::ThreadTaskRunnerHandle::Get()->PostTask(
       FROM_HERE, base::BindOnce(std::move(callback), true));

chromeos/dbus/debug_daemon/fake_debug_daemon_client.h

@@ -90,7 +90,8 @@ class COMPONENT_EXPORT(DEBUG_DAEMON) FakeDebugDaemonClient
                          const base::Closure& error_callback) override;
   void StartConcierge(ConciergeCallback callback) override;
   void StopConcierge(ConciergeCallback callback) override;
-  void StartPluginVmDispatcher(PluginVmDispatcherCallback callback) override;
+  void StartPluginVmDispatcher(const std::string& owner_id,
+                               PluginVmDispatcherCallback callback) override;
   void StopPluginVmDispatcher(PluginVmDispatcherCallback callback) override;
   void SetRlzPingSent(SetRlzPingSentCallback callback) override;
   void SetSchedulerConfigurationV2(