android: content::UIResourceProvider and content::UIResourceClientAndroid

content/browser/android/ui_resource_provider_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 "content/browser/android/ui_resource_provider_impl.h"
+
+#include "cc/resources/ui_resource_client.h"
+#include "cc/trees/layer_tree_host.h"
+#include "content/public/browser/android/ui_resource_client_android.h"
+
+namespace content {
+
+UIResourceProviderImpl::UIResourceProviderImpl() : host_(NULL) {
+}
+
+UIResourceProviderImpl::~UIResourceProviderImpl() {
+  SetLayerTreeHost(NULL);
+}
+
+void UIResourceProviderImpl::SetLayerTreeHost(cc::LayerTreeHost* host) {
+  if (host_ == host)
+    return;
+  host_ = host;
+  UIResourcesAreInvalid();
+}
+
+void UIResourceProviderImpl::UIResourcesAreInvalid() {
+  UIResourceClientMap client_map = ui_resource_client_map_;
+  ui_resource_client_map_.clear();
+  for (UIResourceClientMap::iterator iter = client_map.begin();
+       iter != client_map.end();
+       iter++) {
+    iter->second->UIResourceIsInvalid();
+  }
+}
+
+cc::UIResourceId UIResourceProviderImpl::CreateUIResource(
+    UIResourceClientAndroid* client) {
+  if (!host_)
+    return 0;
+  cc::UIResourceId id = host_->CreateUIResource(client);
+  DCHECK(ui_resource_client_map_.find(id) == ui_resource_client_map_.end());
+
+  ui_resource_client_map_[id] = client;
+  return id;
+}
+
+void UIResourceProviderImpl::DeleteUIResource(cc::UIResourceId ui_resource_id) {
+  UIResourceClientMap::iterator iter =
+      ui_resource_client_map_.find(ui_resource_id);
+  DCHECK(iter != ui_resource_client_map_.end());
+
+  ui_resource_client_map_.erase(iter);
+
+  if (!host_)
+    return;
+  host_->DeleteUIResource(ui_resource_id);
+}
+
+}  // namespace content