Add InspectableWebContents

This class can be used to create a content::WebContents that can be inspected
by the Chrome Dev Tools. This requires embedding applications to copy
content_shell.pak into their resource bundle.

Right now the dev tools are always docked to the bottom of the view; we don't
yet support undocking or changing the docked side.

Fixes #1.

brightray/browser/inspectable_web_contents.h

@@ -0,0 +1,23 @@
+#ifndef BRIGHTRAY_INSPECTABLE_WEB_CONTENTS_H_
+#define BRIGHTRAY_INSPECTABLE_WEB_CONTENTS_H_
+
+#include "content/public/browser/web_contents.h"
+
+namespace brightray {
+
+class InspectableWebContentsView;
+
+class InspectableWebContents {
+public:
+  static InspectableWebContents* Create(const content::WebContents::CreateParams&);
+  virtual ~InspectableWebContents() {}
+
+  virtual InspectableWebContentsView* GetView() const = 0;
+  virtual content::WebContents* GetWebContents() const = 0;
+
+  virtual void ShowDevTools() = 0;
+};
+
+}
+
+#endif