Add a Physical Web WebUI for Android

chrome/browser/ui/webui/physical_web/physical_web_ui.cc

+// 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/physical_web/physical_web_ui.h"
+
+#include "base/metrics/user_metrics.h"
+#include "chrome/browser/browser_process_impl.h"
+#include "chrome/browser/profiles/profile.h"
+#include "chrome/common/url_constants.h"
+#include "components/grit/components_resources.h"
+#include "components/physical_web/data_source/physical_web_data_source.h"
+#include "components/physical_web/webui/physical_web_base_message_handler.h"
+#include "components/physical_web/webui/physical_web_ui_constants.h"
+#include "components/strings/grit/components_strings.h"
+#include "content/public/browser/web_ui_data_source.h"
+#include "content/public/browser/web_ui_message_handler.h"
+
+namespace {
+
+content::WebUIDataSource* CreatePhysicalWebHTMLSource() {
+  content::WebUIDataSource* source = content::WebUIDataSource::Create(
+      chrome::kChromeUIPhysicalWebHost);
+
+  source->AddLocalizedString(physical_web_ui::kTitle,
+                             IDS_PHYSICAL_WEB_UI_TITLE);
+  source->SetJsonPath("strings.js");
+  source->AddResourcePath(physical_web_ui::kPhysicalWebJS,
+                          IDR_PHYSICAL_WEB_UI_JS);
+  source->AddResourcePath(physical_web_ui::kPhysicalWebCSS,
+                          IDR_PHYSICAL_WEB_UI_CSS);
+  source->SetDefaultResource(IDR_PHYSICAL_WEB_UI_HTML);
+  return source;
+}
+
+// Implements all MessageHandler core functionality.  This is extends the
+// PhysicalWebBaseMessageHandler and implements functions to manipulate an
+// Android-specific WebUI object.
+class MessageHandlerImpl
+    : public physical_web_ui::PhysicalWebBaseMessageHandler {
+ public:
+  explicit MessageHandlerImpl(content::WebUI* web_ui) : web_ui_(web_ui) {}
+  ~MessageHandlerImpl() override {}
+
+ private:
+  void RegisterMessageCallback(
+      const std::string& message,
+      const physical_web_ui::MessageCallback& callback) override {
+    web_ui_->RegisterMessageCallback(message, callback);
+  }
+  void CallJavaScriptFunction(const std::string& function,
+                              const base::Value& arg) override {
+    web_ui_->CallJavascriptFunctionUnsafe(function, arg);
+  }
+  physical_web::PhysicalWebDataSource* GetPhysicalWebDataSource() override {
+    return g_browser_process->GetPhysicalWebDataSource();
+  }
+
+  content::WebUI* const web_ui_;
+  DISALLOW_COPY_AND_ASSIGN(MessageHandlerImpl);
+};
+
+class PhysicalWebMessageHandler : public content::WebUIMessageHandler {
+ public:
+  PhysicalWebMessageHandler() {}
+  ~PhysicalWebMessageHandler() override {}
+
+  void RegisterMessages() override {
+    impl_.reset(new MessageHandlerImpl(web_ui()));
+    impl_->RegisterMessages();
+  }
+
+ private:
+  std::unique_ptr<MessageHandlerImpl> impl_;
+  DISALLOW_COPY_AND_ASSIGN(PhysicalWebMessageHandler);
+};
+
+}  // namespace
+
+PhysicalWebUI::PhysicalWebUI(content::WebUI* web_ui)
+    : WebUIController(web_ui) {
+  content::WebUIDataSource::Add(Profile::FromWebUI(web_ui),
+                                CreatePhysicalWebHTMLSource());
+  web_ui->AddMessageHandler(new PhysicalWebMessageHandler());
+  base::RecordAction(base::UserMetricsAction("PhysicalWeb.WebUI.Open"));
+}
+
+PhysicalWebUI::~PhysicalWebUI() = default;