Revert "Delete the ViewManager and WindowManager services."

services/view_manager/view_manager_service_impl.cc

+// Copyright 2014 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "services/view_manager/view_manager_service_impl.h"
+
+#include "base/bind.h"
+#include "base/stl_util.h"
+#include "base/trace_event/trace_event.h"
+#include "mojo/converters/geometry/geometry_type_converters.h"
+#include "mojo/converters/input_events/input_events_type_converters.h"
+#include "mojo/converters/surfaces/surfaces_type_converters.h"
+#include "mojo/services/window_manager/interfaces/window_manager_internal.mojom.h"
+#include "services/view_manager/connection_manager.h"
+#include "services/view_manager/default_access_policy.h"
+#include "services/view_manager/display_manager.h"
+#include "services/view_manager/server_view.h"
+#include "services/view_manager/window_manager_access_policy.h"
+
+using mojo::Array;
+using mojo::Callback;
+using mojo::Id;
+using mojo::InterfaceRequest;
+using mojo::OrderDirection;
+using mojo::ServiceProvider;
+using mojo::ServiceProviderPtr;
+using mojo::String;
+using mojo::ViewDataPtr;
+
+namespace view_manager {
+
+ViewManagerServiceImpl::ViewManagerServiceImpl(
+    ConnectionManager* connection_manager,
+    mojo::ConnectionSpecificId creator_id,
+    const std::string& creator_url,
+    const std::string& url,
+    const ViewId& root_id)
+    : connection_manager_(connection_manager),
+      id_(connection_manager_->GetAndAdvanceNextConnectionId()),
+      url_(url),
+      creator_id_(creator_id),
+      creator_url_(creator_url),
+      client_(nullptr) {
+  CHECK(GetView(root_id));
+  root_.reset(new ViewId(root_id));
+  if (root_id == RootViewId())
+    access_policy_.reset(new WindowManagerAccessPolicy(id_, this));
+  else
+    access_policy_.reset(new DefaultAccessPolicy(id_, this));
+}
+
+ViewManagerServiceImpl::~ViewManagerServiceImpl() {
+  DestroyViews();
+}
+
+void ViewManagerServiceImpl::Init(mojo::ViewManagerClient* client,
+                                  mojo::ViewManagerServicePtr service_ptr,
+                                  InterfaceRequest<ServiceProvider> services,
+                                  ServiceProviderPtr exposed_services) {
+  TRACE_EVENT0("view_manager", __func__);
+  DCHECK(!client_);
+  client_ = client;
+  std::vector<const ServerView*> to_send;
+  if (root_.get())
+    GetUnknownViewsFrom(GetView(*root_), &to_send);
+
+  mojo::MessagePipe pipe;
+  connection_manager_->wm_internal()->CreateWindowManagerForViewManagerClient(
+      id_, pipe.handle1.Pass());
+  client->OnEmbed(id_, creator_url_, ViewToViewData(to_send.front()),
+                  service_ptr.Pass(), services.Pass(), exposed_services.Pass(),
+                  pipe.handle0.Pass());
+}
+
+const ServerView* ViewManagerServiceImpl::GetView(const ViewId& id) const {
+  TRACE_EVENT0("view_manager", __func__);
+  if (id_ == id.connection_id) {
+    ViewMap::const_iterator i = view_map_.find(id.view_id);
+    return i == view_map_.end() ? NULL : i->second;
+  }
+  return connection_manager_->GetView(id);
+}
+
+bool ViewManagerServiceImpl::IsRoot(const ViewId& id) const {
+  return root_.get() && *root_ == id;
+}
+
+void ViewManagerServiceImpl::OnWillDestroyViewManagerServiceImpl(
+    ViewManagerServiceImpl* connection) {
+  if (creator_id_ == connection->id())
+    creator_id_ = kInvalidConnectionId;
+  if (connection->root_ && connection->root_->connection_id == id_ &&
+      view_map_.count(connection->root_->view_id) > 0) {
+    client()->OnEmbeddedAppDisconnected(
+        ViewIdToTransportId(*connection->root_));
+  }
+  if (root_.get() && root_->connection_id == connection->id())
+    root_.reset();
+}
+
+mojo::ErrorCode ViewManagerServiceImpl::CreateView(const ViewId& view_id) {
+  if (view_id.connection_id != id_)
+    return mojo::ErrorCode::ILLEGAL_ARGUMENT;
+  if (view_map_.find(view_id.view_id) != view_map_.end())
+    return mojo::ErrorCode::VALUE_IN_USE;
+  view_map_[view_id.view_id] = connection_manager_->CreateServerView(view_id);
+  known_views_.insert(ViewIdToTransportId(view_id));
+  return mojo::ErrorCode::NONE;
+}
+
+bool ViewManagerServiceImpl::AddView(const ViewId& parent_id,
+                                     const ViewId& child_id) {
+  ServerView* parent = GetView(parent_id);
+  ServerView* child = GetView(child_id);
+  if (parent && child && child->parent() != parent &&
+      !child->Contains(parent) && access_policy_->CanAddView(parent, child)) {
+    ConnectionManager::ScopedChange change(this, connection_manager_, false);
+    parent->Add(child);
+    return true;
+  }
+  return false;
+}
+
+std::vector<const ServerView*> ViewManagerServiceImpl::GetViewTree(
+    const ViewId& view_id) const {
+  const ServerView* view = GetView(view_id);
+  std::vector<const ServerView*> views;
+  if (view)
+    GetViewTreeImpl(view, &views);
+  return views;
+}
+
+bool ViewManagerServiceImpl::SetViewVisibility(const ViewId& view_id,
+                                               bool visible) {
+  ServerView* view = GetView(view_id);
+  if (!view || view->visible() == visible ||
+      !access_policy_->CanChangeViewVisibility(view)) {
+    return false;
+  }
+  ConnectionManager::ScopedChange change(this, connection_manager_, false);
+  view->SetVisible(visible);
+  return true;
+}
+
+bool ViewManagerServiceImpl::EmbedUrl(
+    const std::string& url,
+    const ViewId& view_id,
+    InterfaceRequest<ServiceProvider> services,
+    ServiceProviderPtr exposed_services) {
+  TRACE_EVENT0("view_manager", __func__);
+  if (!PrepareForEmbed(view_id))
+    return false;
+  connection_manager_->EmbedAtView(id_, url, view_id, services.Pass(),
+                                   exposed_services.Pass());
+  return true;
+}
+
+bool ViewManagerServiceImpl::Embed(const ViewId& view_id,
+                                   mojo::ViewManagerClientPtr client) {
+  TRACE_EVENT0("view_manager", __func__);
+  if (!client.get() || !PrepareForEmbed(view_id))
+    return false;
+  connection_manager_->EmbedAtView(id_, view_id, client.Pass());
+  return true;
+}
+
+void ViewManagerServiceImpl::ProcessViewBoundsChanged(
+    const ServerView* view,
+    const gfx::Rect& old_bounds,
+    const gfx::Rect& new_bounds,
+    bool originated_change) {
+  if (originated_change || !IsViewKnown(view))
+    return;
+  client()->OnViewBoundsChanged(ViewIdToTransportId(view->id()),
+                                mojo::Rect::From(old_bounds),
+                                mojo::Rect::From(new_bounds));
+}
+
+void ViewManagerServiceImpl::ProcessViewportMetricsChanged(
+    const mojo::ViewportMetrics& old_metrics,
+    const mojo::ViewportMetrics& new_metrics,
+    bool originated_change) {
+  client()->OnViewViewportMetricsChanged(old_metrics.Clone(),
+                                         new_metrics.Clone());
+}
+
+void ViewManagerServiceImpl::ProcessWillChangeViewHierarchy(
+    const ServerView* view,
+    const ServerView* new_parent,
+    const ServerView* old_parent,
+    bool originated_change) {
+  if (originated_change)
+    return;
+
+  const bool old_drawn = view->IsDrawn(connection_manager_->root());
+  const bool new_drawn = view->visible() && new_parent &&
+                         new_parent->IsDrawn(connection_manager_->root());
+  if (old_drawn == new_drawn)
+    return;
+
+  NotifyDrawnStateChanged(view, new_drawn);
+}
+
+void ViewManagerServiceImpl::ProcessViewPropertyChanged(
+    const ServerView* view,
+    const std::string& name,
+    const std::vector<uint8_t>* new_data,
+    bool originated_change) {
+  if (originated_change)
+    return;
+
+  Array<uint8_t> data;
+  if (new_data)
+    data = Array<uint8_t>::From(*new_data);
+
+  client()->OnViewSharedPropertyChanged(ViewIdToTransportId(view->id()),
+                                        String(name), data.Pass());
+}
+
+void ViewManagerServiceImpl::ProcessViewHierarchyChanged(
+    const ServerView* view,
+    const ServerView* new_parent,
+    const ServerView* old_parent,
+    bool originated_change) {
+  if (originated_change && !IsViewKnown(view) && new_parent &&
+      IsViewKnown(new_parent)) {
+    std::vector<const ServerView*> unused;
+    GetUnknownViewsFrom(view, &unused);
+  }
+  if (originated_change || connection_manager_->is_processing_delete_view() ||
+      connection_manager_->DidConnectionMessageClient(id_)) {
+    return;
+  }
+
+  if (!access_policy_->ShouldNotifyOnHierarchyChange(view, &new_parent,
+                                                     &old_parent)) {
+    return;
+  }
+  // Inform the client of any new views and update the set of views we know
+  // about.
+  std::vector<const ServerView*> to_send;
+  if (!IsViewKnown(view))
+    GetUnknownViewsFrom(view, &to_send);
+  const ViewId new_parent_id(new_parent ? new_parent->id() : ViewId());
+  const ViewId old_parent_id(old_parent ? old_parent->id() : ViewId());
+  client()->OnViewHierarchyChanged(
+      ViewIdToTransportId(view->id()), ViewIdToTransportId(new_parent_id),
+      ViewIdToTransportId(old_parent_id), ViewsToViewDatas(to_send));
+  connection_manager_->OnConnectionMessagedClient(id_);
+}
+
+void ViewManagerServiceImpl::ProcessViewReorder(const ServerView* view,
+                                                const ServerView* relative_view,
+                                                OrderDirection direction,
+                                                bool originated_change) {
+  if (originated_change || !IsViewKnown(view) || !IsViewKnown(relative_view))
+    return;
+
+  client()->OnViewReordered(ViewIdToTransportId(view->id()),
+                            ViewIdToTransportId(relative_view->id()),
+                            direction);
+}
+
+void ViewManagerServiceImpl::ProcessViewDeleted(const ViewId& view,
+                                                bool originated_change) {
+  if (view.connection_id == id_)
+    view_map_.erase(view.view_id);
+
+  const bool in_known = known_views_.erase(ViewIdToTransportId(view)) > 0;
+
+  if (IsRoot(view))
+    root_.reset();
+
+  if (originated_change)
+    return;
+
+  if (in_known) {
+    client()->OnViewDeleted(ViewIdToTransportId(view));
+    connection_manager_->OnConnectionMessagedClient(id_);
+  }
+}
+
+void ViewManagerServiceImpl::ProcessWillChangeViewVisibility(
+    const ServerView* view,
+    bool originated_change) {
+  if (originated_change)
+    return;
+
+  if (IsViewKnown(view)) {
+    client()->OnViewVisibilityChanged(ViewIdToTransportId(view->id()),
+                                      !view->visible());
+    return;
+  }
+
+  bool view_target_drawn_state;
+  if (view->visible()) {
+    // View is being hidden, won't be drawn.
+    view_target_drawn_state = false;
+  } else {
+    // View is being shown. View will be drawn if its parent is drawn.
+    view_target_drawn_state =
+        view->parent() && view->parent()->IsDrawn(connection_manager_->root());
+  }
+
+  NotifyDrawnStateChanged(view, view_target_drawn_state);
+}
+
+bool ViewManagerServiceImpl::IsViewKnown(const ServerView* view) const {
+  return known_views_.count(ViewIdToTransportId(view->id())) > 0;
+}
+
+bool ViewManagerServiceImpl::CanReorderView(const ServerView* view,
+                                            const ServerView* relative_view,
+                                            OrderDirection direction) const {
+  if (!view || !relative_view)
+    return false;
+
+  if (!view->parent() || view->parent() != relative_view->parent())
+    return false;
+
+  if (!access_policy_->CanReorderView(view, relative_view, direction))
+    return false;
+
+  std::vector<const ServerView*> children = view->parent()->GetChildren();
+  const size_t child_i =
+      std::find(children.begin(), children.end(), view) - children.begin();
+  const size_t target_i =
+      std::find(children.begin(), children.end(), relative_view) -
+      children.begin();
+  if ((direction == mojo::OrderDirection::ABOVE && child_i == target_i + 1) ||
+      (direction == mojo::OrderDirection::BELOW && child_i + 1 == target_i)) {
+    return false;
+  }
+
+  return true;
+}
+
+bool ViewManagerServiceImpl::DeleteViewImpl(ViewManagerServiceImpl* source,
+                                            ServerView* view) {
+  DCHECK(view);
+  DCHECK_EQ(view->id().connection_id, id_);
+  ConnectionManager::ScopedChange change(source, connection_manager_, true);
+  delete view;
+  return true;
+}
+
+void ViewManagerServiceImpl::GetUnknownViewsFrom(
+    const ServerView* view,
+    std::vector<const ServerView*>* views) {
+  if (IsViewKnown(view) || !access_policy_->CanGetViewTree(view))
+    return;
+  views->push_back(view);
+  known_views_.insert(ViewIdToTransportId(view->id()));
+  if (!access_policy_->CanDescendIntoViewForViewTree(view))
+    return;
+  std::vector<const ServerView*> children(view->GetChildren());
+  for (size_t i = 0; i < children.size(); ++i)
+    GetUnknownViewsFrom(children[i], views);
+}
+
+void ViewManagerServiceImpl::RemoveFromKnown(
+    const ServerView* view,
+    std::vector<ServerView*>* local_views) {
+  if (view->id().connection_id == id_) {
+    if (local_views)
+      local_views->push_back(GetView(view->id()));
+    return;
+  }
+  known_views_.erase(ViewIdToTransportId(view->id()));
+  std::vector<const ServerView*> children = view->GetChildren();
+  for (size_t i = 0; i < children.size(); ++i)
+    RemoveFromKnown(children[i], local_views);
+}
+
+void ViewManagerServiceImpl::RemoveRoot() {
+  CHECK(root_.get());
+  const ViewId root_id(*root_);
+  root_.reset();
+  // No need to do anything if we created the view.
+  if (root_id.connection_id == id_)
+    return;
+
+  client()->OnViewDeleted(ViewIdToTransportId(root_id));
+  connection_manager_->OnConnectionMessagedClient(id_);
+
+  // This connection no longer knows about the view. Unparent any views that
+  // were parented to views in the root.
+  std::vector<ServerView*> local_views;
+  RemoveFromKnown(GetView(root_id), &local_views);
+  for (size_t i = 0; i < local_views.size(); ++i)
+    local_views[i]->parent()->Remove(local_views[i]);
+}
+
+void ViewManagerServiceImpl::RemoveChildrenAsPartOfEmbed(
+    const ViewId& view_id) {
+  ServerView* view = GetView(view_id);
+  CHECK(view);
+  CHECK(view->id().connection_id == view_id.connection_id);
+  std::vector<ServerView*> children = view->GetChildren();
+  for (size_t i = 0; i < children.size(); ++i)
+    view->Remove(children[i]);
+}
+
+Array<ViewDataPtr> ViewManagerServiceImpl::ViewsToViewDatas(
+    const std::vector<const ServerView*>& views) {
+  auto array = Array<ViewDataPtr>::New(views.size());
+  for (size_t i = 0; i < views.size(); ++i)
+    array[i] = ViewToViewData(views[i]).Pass();
+  return array;
+}
+
+ViewDataPtr ViewManagerServiceImpl::ViewToViewData(const ServerView* view) {
+  DCHECK(IsViewKnown(view));
+  const ServerView* parent = view->parent();
+  // If the parent isn't known, it means the parent is not visible to us (not
+  // in roots), and should not be sent over.
+  if (parent && !IsViewKnown(parent))
+    parent = NULL;
+  ViewDataPtr view_data(mojo::ViewData::New());
+  view_data->parent_id = ViewIdToTransportId(parent ? parent->id() : ViewId());
+  view_data->view_id = ViewIdToTransportId(view->id());
+  view_data->bounds = mojo::Rect::From(view->bounds());
+  view_data->properties =
+      mojo::Map<String, Array<uint8_t>>::From(view->properties());
+  view_data->visible = view->visible();
+  view_data->drawn = view->IsDrawn(connection_manager_->root());
+  view_data->viewport_metrics =
+      connection_manager_->display_manager()->GetViewportMetrics().Clone();
+  return view_data;
+}
+
+void ViewManagerServiceImpl::GetViewTreeImpl(
+    const ServerView* view,
+    std::vector<const ServerView*>* views) const {
+  DCHECK(view);
+
+  if (!access_policy_->CanGetViewTree(view))
+    return;
+
+  views->push_back(view);
+
+  if (!access_policy_->CanDescendIntoViewForViewTree(view))
+    return;
+
+  std::vector<const ServerView*> children(view->GetChildren());
+  for (size_t i = 0; i < children.size(); ++i)
+    GetViewTreeImpl(children[i], views);
+}
+
+void ViewManagerServiceImpl::NotifyDrawnStateChanged(const ServerView* view,
+                                                     bool new_drawn_value) {
+  // Even though we don't know about view, it may be an ancestor of our root, in
+  // which case the change may effect our roots drawn state.
+  if (!root_.get())
+    return;
+
+  const ServerView* root = GetView(*root_);
+  DCHECK(root);
+  if (view->Contains(root) &&
+      (new_drawn_value != root->IsDrawn(connection_manager_->root()))) {
+    client()->OnViewDrawnStateChanged(ViewIdToTransportId(root->id()),
+                                      new_drawn_value);
+  }
+}
+
+void ViewManagerServiceImpl::DestroyViews() {
+  if (!view_map_.empty()) {
+    ConnectionManager::ScopedChange change(this, connection_manager_, true);
+    // If we get here from the destructor we're not going to get
+    // ProcessViewDeleted(). Copy the map and delete from the copy so that we
+    // don't have to worry about whether |view_map_| changes or not.
+    ViewMap view_map_copy;
+    view_map_.swap(view_map_copy);
+    STLDeleteValues(&view_map_copy);
+  }
+}
+
+bool ViewManagerServiceImpl::PrepareForEmbed(const ViewId& view_id) {
+  const ServerView* view = GetView(view_id);
+  if (!view || !access_policy_->CanEmbed(view))
+    return false;
+
+  // Only allow a node to be the root for one connection.
+  ViewManagerServiceImpl* existing_owner =
+      connection_manager_->GetConnectionWithRoot(view_id);
+
+  ConnectionManager::ScopedChange change(this, connection_manager_, true);
+  RemoveChildrenAsPartOfEmbed(view_id);
+  if (existing_owner) {
+    // Never message the originating connection.
+    connection_manager_->OnConnectionMessagedClient(id_);
+    existing_owner->RemoveRoot();
+  }
+  return true;
+}
+
+void ViewManagerServiceImpl::CreateView(
+    Id transport_view_id,
+    const Callback<void(mojo::ErrorCode)>& callback) {
+  callback.Run(CreateView(ViewIdFromTransportId(transport_view_id)));
+}
+
+void ViewManagerServiceImpl::DeleteView(Id transport_view_id,
+                                        const Callback<void(bool)>& callback) {
+  ServerView* view = GetView(ViewIdFromTransportId(transport_view_id));
+  bool success = false;
+  if (view && access_policy_->CanDeleteView(view)) {
+    ViewManagerServiceImpl* connection =
+        connection_manager_->GetConnection(view->id().connection_id);
+    success = connection && connection->DeleteViewImpl(this, view);
+  }
+  callback.Run(success);
+}
+
+void ViewManagerServiceImpl::AddView(Id parent_id,
+                                     Id child_id,
+                                     const Callback<void(bool)>& callback) {
+  callback.Run(AddView(ViewIdFromTransportId(parent_id),
+                       ViewIdFromTransportId(child_id)));
+}
+
+void ViewManagerServiceImpl::RemoveViewFromParent(
+    Id view_id,
+    const Callback<void(bool)>& callback) {
+  bool success = false;
+  ServerView* view = GetView(ViewIdFromTransportId(view_id));
+  if (view && view->parent() && access_policy_->CanRemoveViewFromParent(view)) {
+    success = true;
+    ConnectionManager::ScopedChange change(this, connection_manager_, false);
+    view->parent()->Remove(view);
+  }
+  callback.Run(success);
+}
+
+void ViewManagerServiceImpl::ReorderView(Id view_id,
+                                         Id relative_view_id,
+                                         OrderDirection direction,
+                                         const Callback<void(bool)>& callback) {
+  bool success = false;
+  ServerView* view = GetView(ViewIdFromTransportId(view_id));
+  ServerView* relative_view = GetView(ViewIdFromTransportId(relative_view_id));
+  if (CanReorderView(view, relative_view, direction)) {
+    success = true;
+    ConnectionManager::ScopedChange change(this, connection_manager_, false);
+    view->parent()->Reorder(view, relative_view, direction);
+    connection_manager_->ProcessViewReorder(view, relative_view, direction);
+  }
+  callback.Run(success);
+}
+
+void ViewManagerServiceImpl::GetViewTree(
+    Id view_id,
+    const Callback<void(Array<ViewDataPtr>)>& callback) {
+  std::vector<const ServerView*> views(
+      GetViewTree(ViewIdFromTransportId(view_id)));
+  callback.Run(ViewsToViewDatas(views));
+}
+
+void ViewManagerServiceImpl::SetViewSurfaceId(
+    Id view_id,
+    mojo::SurfaceIdPtr surface_id,
+    const Callback<void(bool)>& callback) {
+  // TODO(sky): add coverage of not being able to set for random node.
+  ServerView* view = GetView(ViewIdFromTransportId(view_id));
+  if (!view || !access_policy_->CanSetViewSurfaceId(view)) {
+    callback.Run(false);
+    return;
+  }
+  view->SetSurfaceId(surface_id.To<cc::SurfaceId>());
+  callback.Run(true);
+}
+
+void ViewManagerServiceImpl::SetViewBounds(
+    Id view_id,
+    mojo::RectPtr bounds,
+    const Callback<void(bool)>& callback) {
+  ServerView* view = GetView(ViewIdFromTransportId(view_id));
+  const bool success = view && access_policy_->CanSetViewBounds(view);
+  if (success) {
+    ConnectionManager::ScopedChange change(this, connection_manager_, false);
+    view->SetBounds(bounds.To<gfx::Rect>());
+  }
+  callback.Run(success);
+}
+
+void ViewManagerServiceImpl::SetViewVisibility(
+    Id transport_view_id,
+    bool visible,
+    const Callback<void(bool)>& callback) {
+  callback.Run(
+      SetViewVisibility(ViewIdFromTransportId(transport_view_id), visible));
+}
+
+void ViewManagerServiceImpl::SetViewProperty(
+    uint32_t view_id,
+    const mojo::String& name,
+    mojo::Array<uint8_t> value,
+    const mojo::Callback<void(bool)>& callback) {
+  ServerView* view = GetView(ViewIdFromTransportId(view_id));
+  const bool success = view && access_policy_->CanSetViewProperties(view);
+  if (success) {
+    ConnectionManager::ScopedChange change(this, connection_manager_, false);
+
+    if (value.is_null()) {
+      view->SetProperty(name, nullptr);
+    } else {
+      std::vector<uint8_t> data = value.To<std::vector<uint8_t>>();
+      view->SetProperty(name, &data);
+    }
+  }
+  callback.Run(success);
+}
+
+void ViewManagerServiceImpl::EmbedUrl(
+    const String& url,
+    Id transport_view_id,
+    InterfaceRequest<ServiceProvider> services,
+    ServiceProviderPtr exposed_services,
+    const Callback<void(bool)>& callback) {
+  callback.Run(EmbedUrl(url.To<std::string>(),
+                        ViewIdFromTransportId(transport_view_id),
+                        services.Pass(), exposed_services.Pass()));
+}
+
+void ViewManagerServiceImpl::Embed(mojo::Id transport_view_id,
+                                   mojo::ViewManagerClientPtr client,
+                                   const mojo::Callback<void(bool)>& callback) {
+  callback.Run(Embed(ViewIdFromTransportId(transport_view_id), client.Pass()));
+}
+
+void ViewManagerServiceImpl::PerformAction(
+    mojo::Id transport_view_id,
+    const mojo::String& action,
+    const mojo::Callback<void(bool)>& callback) {
+  TRACE_EVENT0("view_manager", __func__);
+  connection_manager_->GetWindowManagerViewManagerClient()->OnPerformAction(
+      transport_view_id, action, callback);
+}
+
+bool ViewManagerServiceImpl::IsRootForAccessPolicy(const ViewId& id) const {
+  return IsRoot(id);
+}
+
+bool ViewManagerServiceImpl::IsViewKnownForAccessPolicy(
+    const ServerView* view) const {
+  return IsViewKnown(view);
+}
+
+bool ViewManagerServiceImpl::IsViewRootOfAnotherConnectionForAccessPolicy(
+    const ServerView* view) const {
+  ViewManagerServiceImpl* connection =
+      connection_manager_->GetConnectionWithRoot(view->id());
+  return connection && connection != this;
+}
+
+}  // namespace view_manager