Show data usage on Site Details (MDSettings)

chrome/browser/ui/webui/settings/site_settings_handler.cc

Index: chrome/browser/ui/webui/settings/site_settings_handler.cc
diff --git a/chrome/browser/ui/webui/settings/site_settings_handler.cc b/chrome/browser/ui/webui/settings/site_settings_handler.cc
new file mode 100644
index 0000000000000000000000000000000000000000..490b179cdd99f2faa87296836592619fefa73e0b
--- /dev/null
+++ b/chrome/browser/ui/webui/settings/site_settings_handler.cc
@@ -0,0 +1,63 @@
+// Copyright 2016 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 "chrome/browser/ui/webui/settings/site_settings_handler.h"
+
+#include "base/bind.h"
+#include "base/values.h"
+#include "chrome/browser/profiles/profile.h"
+#include "components/content_settings/core/common/content_settings_types.h"
+#include "content/public/browser/browser_thread.h"
+#include "content/public/browser/storage_partition.h"
+#include "content/public/browser/web_ui.h"
+#include "ui/base/text/bytes_formatting.h"
+
+namespace settings {
+
+SiteSettingsHandler::SiteSettingsHandler(Profile* profile)
+    : profile_(profile) {
+}
+
+SiteSettingsHandler::~SiteSettingsHandler() {
+  if (storage_info_fetcher_.get())
+    storage_info_fetcher_->RemoveObserver(this);
+}
+
+void SiteSettingsHandler::RegisterMessages() {
+  web_ui()->RegisterMessageCallback(
+      "fetchUsageTotal",
+      base::Bind(&SiteSettingsHandler::HandleFetchUsageTotal,
+                 base::Unretained(this)));
+}
+
+void SiteSettingsHandler::OnGetUsageInfo(
+    const storage::UsageInfoEntries& entries) {
+  DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
+
+  for (const auto& entry : entries) {
+    if (entry.usage <= 0) continue;
+    if (entry.host == usage_host_) {
+      web_ui()->CallJavascriptFunction(
+         "settings.WebsiteUsagePrivateApi.returnUsageTotal",
+         base::StringValue(entry.host),
+         base::StringValue(ui::FormatBytes(entry.usage)));
+      return;
+    }
+  }
+}
+
+void SiteSettingsHandler::HandleFetchUsageTotal(
+    const base::ListValue* args) {
+  CHECK_EQ(1U, args->GetSize());
+  std::string host;
+  CHECK(args->GetString(0, &host));
+  usage_host_ = host;
+  storage_info_fetcher_ = new StorageInfoFetcher(
+      content::BrowserContext::GetDefaultStoragePartition(
+          profile_)->GetQuotaManager());
+  storage_info_fetcher_->AddObserver(this);
+  storage_info_fetcher_->Run();
+}
+
+}  // namespace settings