Add chrome://slow for enabling performance tracing for feedback reports.

chrome/browser/ui/webui/chromeos/slow_ui.cc

Index: chrome/browser/ui/webui/chromeos/slow_ui.cc
diff --git a/chrome/browser/ui/webui/chromeos/slow_ui.cc b/chrome/browser/ui/webui/chromeos/slow_ui.cc
new file mode 100644
index 0000000000000000000000000000000000000000..c284f83314eec133007cea299fe5a144e4b0d362
--- /dev/null
+++ b/chrome/browser/ui/webui/chromeos/slow_ui.cc
@@ -0,0 +1,140 @@
+// Copyright (c) 2013 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/chromeos/slow_ui.h"
+
+#include <string>
+
+#include "base/bind.h"
+#include "base/prefs/pref_change_registrar.h"
+#include "base/prefs/pref_service.h"
+#include "base/values.h"
+#include "chrome/browser/profiles/profile.h"
+#include "chrome/common/pref_names.h"
+#include "chrome/common/url_constants.h"
+#include "content/public/browser/web_contents.h"
+#include "content/public/browser/web_ui.h"
+#include "content/public/browser/web_ui_data_source.h"
+#include "content/public/browser/web_ui_message_handler.h"
+#include "grit/browser_resources.h"
+#include "grit/generated_resources.h"
+#include "ui/base/l10n/l10n_util.h"
+#include "ui/base/resource/resource_bundle.h"
+#include "ui/webui/jstemplate_builder.h"
+#include "ui/webui/web_ui_util.h"
+
+using content::WebUIMessageHandler;
+
+namespace {
+
+// JS API callbacks names.
+const char kJsApiDisableTracing[] = "disableTracing";
+const char kJsApiEnableTracing[] = "enableTracing";
+const char kJsApiLoadComplete[] = "loadComplete";
+
+// Page JS API function names.
+const char kJsApiTracingPrefChanged[] = "options.Slow.tracingPrefChanged";
+
+}  // namespace
+
+namespace chromeos {
+
+content::WebUIDataSource* CreateSlowUIHTMLSource() {
+  content::WebUIDataSource* source =
+      content::WebUIDataSource::Create(chrome::kChromeUISlowHost);
+
+  source->SetUseJsonJSFormatV2();
+  source->AddLocalizedString("slowDisable", IDS_SLOW_DISABLE);
+  source->AddLocalizedString("slowEnable", IDS_SLOW_ENABLE);
+  source->AddLocalizedString("slowDescription", IDS_SLOW_DESCRIPTION);
+  source->AddLocalizedString("slowWarning", IDS_SLOW_WARNING);
+

[James Cook, 2013/08/10 00:03:21]

nit: one blank line

[Zachary Kuznia, 2013/08/10 00:05:46]

Done.

+
+  source->SetJsonPath("strings.js");
+  source->AddResourcePath("slow.js", IDR_SLOW_JS);
+  source->SetDefaultResource(IDR_SLOW_HTML);
+  return source;
+}
+
+// The handler for Javascript messages related to the "slow" view.
+class SlowHandler : public WebUIMessageHandler {
+ public:
+  explicit SlowHandler(Profile* profile);
+  virtual ~SlowHandler();
+
+  // WebUIMessageHandler implementation.
+  virtual void RegisterMessages() OVERRIDE;
+
+ private:
+  void UpdatePage();
+
+  // Handlers for JS WebUI messages.
+  void HandleDisable(const ListValue* args);
+  void HandleEnable(const ListValue* args);
+  void LoadComplete(const ListValue* args);
+
+  Profile* profile_;
+  scoped_ptr<PrefChangeRegistrar> user_pref_registrar_;
+
+  DISALLOW_COPY_AND_ASSIGN(SlowHandler);
+};
+
+// SlowHandler ------------------------------------------------------------
+
+SlowHandler::SlowHandler(Profile* profile) : profile_(profile) {
+}
+
+SlowHandler::~SlowHandler() {
+}
+
+void SlowHandler::RegisterMessages() {
+  web_ui()->RegisterMessageCallback(kJsApiDisableTracing,
+      base::Bind(&SlowHandler::HandleDisable, base::Unretained(this)));
+  web_ui()->RegisterMessageCallback(kJsApiEnableTracing,
+      base::Bind(&SlowHandler::HandleEnable, base::Unretained(this)));
+  web_ui()->RegisterMessageCallback(kJsApiLoadComplete,
+      base::Bind(&SlowHandler::LoadComplete, base::Unretained(this)));
+
+  user_pref_registrar_.reset(new PrefChangeRegistrar);
+  user_pref_registrar_->Init(profile_->GetPrefs());
+  user_pref_registrar_->Add(prefs::kPerformanceTracingEnabled,
+                            base::Bind(&SlowHandler::UpdatePage,
+                                       base::Unretained(this)));
+}
+
+void SlowHandler::HandleDisable(const ListValue* args) {
+  PrefService* pref_service = profile_->GetPrefs();
+  pref_service->SetBoolean(prefs::kPerformanceTracingEnabled, false);
+}
+
+void SlowHandler::HandleEnable(const ListValue* args) {
+  PrefService* pref_service = profile_->GetPrefs();
+  pref_service->SetBoolean(prefs::kPerformanceTracingEnabled, true);
+}
+
+void SlowHandler::LoadComplete(const ListValue* args) {
+  UpdatePage();
+}
+
+void SlowHandler::UpdatePage() {
+  PrefService* pref_service = profile_->GetPrefs();
+  bool enabled = pref_service->GetBoolean(prefs::kPerformanceTracingEnabled);
+  base::FundamentalValue pref_value(enabled);
+  web_ui()->CallJavascriptFunction(kJsApiTracingPrefChanged, pref_value);
+}
+
+// SlowUI -----------------------------------------------------------------
+
+SlowUI::SlowUI(content::WebUI* web_ui) : WebUIController(web_ui) {
+  Profile* profile = Profile::FromWebUI(web_ui);
+
+  SlowHandler* handler = new SlowHandler(profile);
+  web_ui->AddMessageHandler(handler);
+
+  // Set up the chrome://slow/ source.
+  content::WebUIDataSource::Add(profile, CreateSlowUIHTMLSource());
+}
+
+}  // namespace chromeos
+