Fixing iframe jank in the local omnibox popup.

chrome/browser/search/suggestion_source.h

+// Copyright 2013 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 CHROME_BROWSER_SEARCH_SUGGESTION_SOURCE_H_
+#define CHROME_BROWSER_SEARCH_SUGGESTION_SOURCE_H_
+
+#include "base/basictypes.h"
+#include "base/compiler_specific.h"
+#include "base/gtest_prod_util.h"
+#include "content/public/browser/url_data_source.h"
+
+// Serves HTML for displaying suggestions using iframes, e.g.
+// chrome-search://suggestion/loader.html
+class SuggestionSource : public content::URLDataSource {
+ public:
+  SuggestionSource();
+
+  virtual ~SuggestionSource();
+
+ private:
+  friend class SuggestionSourceTest;
+  FRIEND_TEST_ALL_PREFIXES(SuggestionSourceTest, ShouldServiceRequest);
+  FRIEND_TEST_ALL_PREFIXES(SuggestionSourceTest, GetMimeType);
+  FRIEND_TEST_ALL_PREFIXES(SuggestionSourceTest, StartDataRequest);
+
+  // Overridden from content::URLDataSource:
+  virtual std::string GetSource() OVERRIDE;
+  virtual void StartDataRequest(
+      const std::string& path_and_query,
+      bool is_incognito,
+      const content::URLDataSource::GotDataCallback& callback) OVERRIDE;
+  virtual std::string GetMimeType(
+      const std::string& path_and_query) const OVERRIDE;
+  virtual bool ShouldDenyXFrameOptions() const OVERRIDE;
+  virtual bool ShouldServiceRequest(
+      const net::URLRequest* request) const OVERRIDE;
+
+  // Sends unmodified resource bytes.
+  void SendResource(
+      int resource_id,
+      const content::URLDataSource::GotDataCallback& callback);
+
+  // Sends Javascript with an &origin parameter interpolated.
+  void SendJSWithOrigin(
+      int resource_id,
+      const std::string& path_and_query,
+      const content::URLDataSource::GotDataCallback& callback);
+
+  DISALLOW_COPY_AND_ASSIGN(SuggestionSource);
+};
+
+#endif  // CHROME_BROWSER_SEARCH_SUGGESTION_SOURCE_H_