Add content API for DevTools HTTP handler

content/public/browser/devtools_http_handler_delegate.h

Index: content/public/browser/devtools_http_handler_delegate.h
diff --git a/content/public/browser/devtools_http_handler_delegate.h b/content/public/browser/devtools_http_handler_delegate.h
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+// Copyright (c) 2011 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 CONTENT_PUBLIC_BROWSER_DEVTOOLS_HTTP_HANDLER_DELEGATE_H_
+#define CONTENT_PUBLIC_BROWSER_DEVTOOLS_HTTP_HANDLER_DELEGATE_H_
+#pragma once
+
+#include <string>
+#include <vector>
+
+class TabContents;
+
+namespace net {
+class URLRequestContext;
+}
+
+namespace content {
+
+class DevToolsHttpHandlerDelegate {
+ public:
+  typedef std::vector<TabContents*> InspectableTabs;
+  virtual ~DevToolsHttpHandlerDelegate() {}
+
+  // Should return the list of inspectable tabs. Called on the UI thread.
+  virtual InspectableTabs GetInspectableTabs() = 0;
+
+  // Should return discovery page HTML that should list available tabs
+  // and provide attach links. Called on the IO thread.
+  virtual std::string GetDiscoveryPageHTML() = 0;
+
+  // Should return URL request context for issuing requests against devtools
+  // webui or NULL if no context is available. Called on the IO thread.
+  virtual net::URLRequestContext* GetURLRequestContext() = 0;
+};
+
+}  // namespace content
+
+#endif  // CONTENT_PUBLIC_BROWSER_DEVTOOLS_HTTP_HANDLER_DELEGATE_H_