Add the supporting code for the cast system tray integration

chrome/browser/ui/ash/cast_config_delegate_chromeos.cc

+// Copyright 2015 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/ash/cast_config_delegate_chromeos.h"
+
+#include <string>
+
+#include "base/memory/scoped_ptr.h"
+#include "base/strings/utf_string_conversions.h"
+#include "chrome/browser/extensions/api/tab_capture/tab_capture_api.h"
+#include "chrome/browser/profiles/profile_manager.h"
+#include "chrome/browser/ui/browser_navigator.h"
+#include "content/public/browser/render_view_host.h"
+#include "extensions/browser/extension_host.h"
+#include "extensions/browser/extension_registry.h"
+#include "extensions/browser/process_manager.h"
+#include "extensions/common/extension.h"
+
+namespace chromeos {
+namespace {
+
+using JavaScriptResultCallback =
+    content::RenderFrameHost::JavaScriptResultCallback;

[jennyz, 2015/05/07 21:50:35]

Just "using content::RenderFrameHost::JavaScriptResultCallback" is enough.

[jdufault, 2015/05/07 23:41:53]

Compile error :(

+
+// Returns the cast extension if it exists.
+const extensions::Extension* FindCastExtension() {
+  Profile* profile = ProfileManager::GetActiveUserProfile();
+  const extensions::ExtensionRegistry* extension_registry =
+      extensions::ExtensionRegistry::Get(profile);
+  const extensions::ExtensionSet& enabled_extensions =
+      extension_registry->enabled_extensions();
+
+  for (size_t i = 0; i < arraysize(extensions::kChromecastExtensionIds); ++i) {
+    const std::string extension_id(extensions::kChromecastExtensionIds[i]);
+    if (enabled_extensions.Contains(extension_id)) {
+      return extension_registry->GetExtensionById(
+          extension_id, extensions::ExtensionRegistry::ENABLED);
+    }
+  }
+  return nullptr;
+}
+
+// Utility method that returns the currently active RenderViewHost.
+content::RenderViewHost* GetRenderViewHost() {
+  const extensions::Extension* extension = FindCastExtension();
+  Profile* profile = ProfileManager::GetActiveUserProfile();

[jennyz, 2015/05/07 21:50:35]

Do you need to check if profile is nullptr?

[jdufault, 2015/05/07 23:41:53]

Done.

+  extensions::ProcessManager* pm = extensions::ProcessManager::Get(profile);
+  return pm->GetBackgroundHostForExtension(extension->id())->render_view_host();

[jennyz, 2015/05/07 21:50:35]

Will extension ever possible be nullptr?

[jdufault, 2015/05/07 23:41:53]

Done.

+}
+
+// Executes JavaScript in the context of the cast extension's background page.
+void ExecuteJavaScript(const std::string& javascript) {
+  GetRenderViewHost()->GetMainFrame()->ExecuteJavaScript(
+      base::UTF8ToUTF16(javascript));
+}
+
+// Executes JavaScript in the context of the cast extension's background page.
+// Invokes |callback| with the return value of the invoked javascript.
+void ExecuteJavaScriptWithCallback(const std::string& javascript,
+                                   const JavaScriptResultCallback& callback) {
+  GetRenderViewHost()->GetMainFrame()->ExecuteJavaScript(
+      base::UTF8ToUTF16(javascript), callback);
+}
+
+// Handler for GetReceiversAndActivities.
+void GetReceiversAndActivitiesCallback(
+    const ash::CastConfigDelegate::ReceiversAndActivitesCallback& callback,
+    const base::Value* value) {
+  ash::CastConfigDelegate::ReceiversAndActivites receiver_activites;
+  const base::ListValue* ra_list = nullptr;
+  if (value->GetAsList(&ra_list)) {
+    for (auto i = ra_list->begin(); i != ra_list->end(); ++i) {
+      const base::DictionaryValue* ra_dict = nullptr;
+      if ((*i)->GetAsDictionary(&ra_dict)) {
+        const base::DictionaryValue* receiver_dict(nullptr),
+            *activity_dict(nullptr);
+        ash::CastConfigDelegate::ReceiverAndActivity receiver_activity;
+        if (ra_dict->GetDictionary("receiver", &receiver_dict)) {
+          receiver_dict->GetString("name", &receiver_activity.receiver.name);
+          receiver_dict->GetString("id", &receiver_activity.receiver.id);
+        }
+        if (ra_dict->GetDictionary("activity", &activity_dict) &&
+            !activity_dict->empty()) {
+          activity_dict->GetString("id", &receiver_activity.activity.id);
+          activity_dict->GetString("title", &receiver_activity.activity.title);
+          activity_dict->GetString("activityType",
+                                   &receiver_activity.activity.activity_type);
+          activity_dict->GetBoolean("allowStop",
+                                    &receiver_activity.activity.allow_stop);
+          activity_dict->GetInteger("tabId",
+                                    &receiver_activity.activity.tab_id);
+        }
+        receiver_activites[receiver_activity.receiver.id] = receiver_activity;
+      }
+    }
+  }
+  callback.Run(receiver_activites);
+}
+
+}  // namespace
+
+CastConfigDelegateChromeos::CastConfigDelegateChromeos() {
+}
+
+CastConfigDelegateChromeos::~CastConfigDelegateChromeos() {
+}
+
+bool CastConfigDelegateChromeos::HasCastExtension() {
+  return FindCastExtension() != nullptr;
+}
+
+void CastConfigDelegateChromeos::GetReceiversAndActivities(
+    const ReceiversAndActivitesCallback& callback) {
+  ExecuteJavaScriptWithCallback(
+      "backgroundSetup.getMirrorCapableReceiversAndActivities();",
+      base::Bind(&GetReceiversAndActivitiesCallback, callback));
+}
+
+void CastConfigDelegateChromeos::CastToReceiver(
+    const std::string& receiver_id) {
+  ExecuteJavaScript("backgroundSetup.launchDesktopMirroring('" + receiver_id +
+                    "');");
+}
+
+void CastConfigDelegateChromeos::StopCasting(const std::string& activity_id) {
+  ExecuteJavaScript("backgroundSetup.stopCastMirroring('user-stop');");
+}
+
+void CastConfigDelegateChromeos::LaunchCastOptions() {
+  chrome::NavigateParams params(
+      ProfileManager::GetActiveUserProfile(),
+      FindCastExtension()->GetResourceURL("options.html"),
+      ui::PAGE_TRANSITION_LINK);
+  params.disposition = NEW_FOREGROUND_TAB;
+  params.window_action = chrome::NavigateParams::SHOW_WINDOW;
+  chrome::Navigate(&params);
+}
+
+}  // namespace chromeos