headless: Initial headless embedder API implementation

headless/public/headless_web_contents.h

Index: headless/public/headless_web_contents.h
diff --git a/headless/public/headless_web_contents.h b/headless/public/headless_web_contents.h
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+// 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_HEADLESS_WEB_CONTENTS_H_
+#define HEADLESS_PUBLIC_HEADLESS_WEB_CONTENTS_H_
+
+#include "base/callback.h"
+#include "base/macros.h"
+#include "base/memory/scoped_ptr.h"
+#include "headless/public/headless_export.h"
+#include "url/gurl.h"
+
+namespace headless {
+
+// Class representing contents of a browser tab. Should be accessed from browser
+// main thread.
+class HEADLESS_EXPORT HeadlessWebContents {
+ public:
+  virtual ~HeadlessWebContents() {}
+
+  // TODO(skyostil): Replace this with an equivalent client API.
+  class Observer {
+   public:
+    // Will be called on browser thread.
+    virtual void DocumentOnLoadCompletedInMainFrame() = 0;
+
+   protected:
+    Observer() {}
+    virtual ~Observer() {}
+
+   private:
+    DISALLOW_COPY_AND_ASSIGN(Observer);
+  };
+
+  // TODO(skyostil): Replace this with an equivalent client API.
+  virtual bool OpenURL(const GURL& url) = 0;
+
+  // Add or remove an observer to receive events from this WebContents.
+  // |observer| must outlive this class or be removed prior to being destroyed.
+  virtual void AddObserver(Observer* observer) = 0;
+  virtual void RemoveObserver(Observer* observer) = 0;
+
+ private:
+  friend class HeadlessWebContentsImpl;
+  HeadlessWebContents() {}
+
+  DISALLOW_COPY_AND_ASSIGN(HeadlessWebContents);
+};
+
+}  // namespace headless
+
+#endif  // HEADLESS_PUBLIC_HEADLESS_WEB_CONTENTS_H_