[headless] Initial skeleton of headless/public/

headless/public/web_frame.h

+// 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.
+
+#ifndef HEADLESS_PUBLIC_WEB_FRAME_H_
+#define HEADLESS_PUBLIC_WEB_FRAME_H_
+
+#include "base/callback.h"
+#include "base/macros.h"
+#include "base/values.h"
+#include "headless/public/headless_export.h"
+
+namespace headless {
+
+class WebDocument;
+
+// Class representing a frame in a web page (e.g. main frame or an iframe).
+// Should be accessed from renderer main thread.
+class HEADLESS_EXPORT WebFrame {
+ public:
+  virtual ~WebFrame() {}
+
+  using ScriptExecutionCallback =
+      base::Callback<void(const std::vector<scoped_ptr<base::Value>>&)>;
+
+  // Schedule given script for execution.
+  virtual void ExecuteScript(const std::string& source_code) = 0;
+
+  // Execute given script and return its result.
+  // Returned value will be converted to json (base::Value).
+  // Special effects to bear in mind:
+  // - Boolean will be converted to base::FundamentalValue (no surprises here).
+  // - Number will be converted to base::FundamentalValue.
+  // - Array will be converted to base::ListValue.
+  //   Note: All non-numerical properties will be omitted
+  //   (e.g. "array = [1, 2, 3]; array['property'] = 'value'; return array"
+  //    will return [1, 2, 3]).
+  // - Object will be converted to base::DictionaryValue
+  //   Note: Only string can be key in base::DictionaryValue, so all non-string
+  //   properties will be omitted
+  //   (e.g. "obj = Object(); obj['key'] = 'value'; obj[0] = 42;" will return
+  //    {"key":"value"}).
+  virtual void ExecuteScriptAndReturnValue(
+      const std::string& source_code,
+      const ScriptExecutionCallback& callback) = 0;
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(WebFrame);
+};
+
+}  // namespace headless
+
+#endif  // HEADLESS_PUBLIC_WEB_FRAME_H_