feat: [extensions] implement a couple of tabs APIs (#21779)

shell/browser/extensions/api/tabs/tabs_api.h

@@ -0,0 +1,49 @@
+// Copyright (c) 2019 Slack Technologies, Inc.
+// Use of this source code is governed by the MIT license that can be
+// found in the LICENSE file.
+
+#ifndef SHELL_BROWSER_EXTENSIONS_API_TABS_TABS_API_H_
+#define SHELL_BROWSER_EXTENSIONS_API_TABS_TABS_API_H_
+
+#include <string>
+
+#include "extensions/browser/api/execute_code_function.h"
+#include "extensions/browser/extension_function.h"
+#include "extensions/common/extension_resource.h"
+#include "url/gurl.h"
+
+namespace extensions {
+
+// Implement API call tabs.executeScript and tabs.insertCSS.
+class ExecuteCodeInTabFunction : public ExecuteCodeFunction {
+ public:
+  ExecuteCodeInTabFunction();
+
+ protected:
+  ~ExecuteCodeInTabFunction() override;
+
+  // Initializes |execute_tab_id_| and |details_|.
+  InitResult Init() override;
+  bool CanExecuteScriptOnPage(std::string* error) override;
+  ScriptExecutor* GetScriptExecutor(std::string* error) override;
+  bool IsWebView() const override;
+  const GURL& GetWebViewSrc() const override;
+
+ private:
+  // Id of tab which executes code.
+  int execute_tab_id_;
+};
+
+class TabsExecuteScriptFunction : public ExecuteCodeInTabFunction {
+ protected:
+  bool ShouldInsertCSS() const override;
+
+ private:
+  ~TabsExecuteScriptFunction() override {}
+
+  DECLARE_EXTENSION_FUNCTION("tabs.executeScript", TABS_EXECUTESCRIPT)
+};
+
+}  // namespace extensions
+
+#endif  // SHELL_BROWSER_EXTENSIONS_API_TABS_TABS_API_H_