Get signals working in the EXTRA_DATA section of MHTML

content/public/browser/mhtml_extra_data.h

Index: content/public/browser/mhtml_extra_data.h
diff --git a/content/public/browser/mhtml_extra_data.h b/content/public/browser/mhtml_extra_data.h
new file mode 100644
index 0000000000000000000000000000000000000000..0fe0e0920b4155e477ad80fcf26522c449b39e06
--- /dev/null
+++ b/content/public/browser/mhtml_extra_data.h
@@ -0,0 +1,31 @@
+// Copyright (c) 2017 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_MHTML_EXTRA_DATA_H_
+#define CONTENT_PUBLIC_BROWSER_MHTML_EXTRA_DATA_H_
+
+#include "base/supports_user_data.h"
+#include "content/public/browser/web_contents.h"
+
+namespace content {
+
+// Interface class for adding an extra part to MHTML when doing MHTML
+// generation.  To use it, get it from the web contents with FromWebContents,
+// then call StashMHTMLPartForAdditionToPage to add a new part.

[fgorski, 2017/03/28 17:01:12]

please rename

[Pete Williamson, 2017/03/28 18:01:58]

Done.

+class CONTENT_EXPORT MHTMLExtraData : public base::SupportsUserData::Data {
+ public:
+  // Retrieves the extra data from the web contents.
+  static MHTMLExtraData* FromWebContents(WebContents* contents);
+
+  // Construct and save an extra MHTML part which will be added to the MHTML

[fgorski, 2017/03/28 17:01:12]

I believe this had better documentation in implementation of MHTMLExtraData.

[Pete Williamson, 2017/03/28 18:01:58]

Moved comments from the interface to here.

+  // when we generate the page with MHTMLGenerationManager::SaveMHTML().
+  virtual void StashMHTMLPartForAdditionToPage(

[fgorski, 2017/03/28 17:01:12]

please rename

[Pete Williamson, 2017/03/28 18:01:58]

Done.

+      const std::string& content_type,
+      const std::string& content_location,
+      const std::string& body) = 0;
+};
+
+}  // namespace content
+
+#endif  // CONTENT_PUBLIC_BROWSER_MHTML_EXTRA_DATA_H_