Split out MHTMLFrameSerializerDelegate class to a new file

And also renames to FrameSerializerDelegateImpl.
This class will be used when creating a web bundle.

Bug: 1040752
Change-Id: Ia42a374a005ea688003b5ede3f06c596a4c55304
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2010239Reviewed-by: Jian Li <jianli@chromium.org>
Reviewed-by: Kinuko Yasuda <kinuko@chromium.org>
Reviewed-by: Kunihiko Sakamoto <ksakamoto@chromium.org>
Commit-Queue: Tsuyoshi Horo <horo@chromium.org>
Cr-Commit-Position: refs/heads/master@{#733851}

third_party/blink/renderer/core/frame/BUILD.gn

@@ -75,6 +75,8 @@ blink_core_sources("frame") {
     "frame_owner.h",
     "frame_serializer.cc",
     "frame_serializer.h",
+    "frame_serializer_delegate_impl.cc",
+    "frame_serializer_delegate_impl.h",
     "frame_types.h",
     "frame_view.cc",
     "frame_view.h",

third_party/blink/renderer/core/frame/frame_serializer_delegate_impl.h

+// Copyright 2020 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 THIRD_PARTY_BLINK_RENDERER_CORE_FRAME_FRAME_SERIALIZER_DELEGATE_IMPL_H_
+#define THIRD_PARTY_BLINK_RENDERER_CORE_FRAME_FRAME_SERIALIZER_DELEGATE_IMPL_H_
+
+#include "third_party/blink/renderer/core/frame/frame_serializer.h"
+
+#include "third_party/blink/public/web/web_frame_serializer.h"
+#include "third_party/blink/renderer/core/dom/element.h"
+#include "third_party/blink/renderer/platform/heap/heap_allocator.h"
+#include "third_party/blink/renderer/platform/heap/member.h"
+
+namespace blink {
+
+class Frame;
+class KURL;
+class HTMLImageElement;
+
+// An implementation of FrameSerializer's delegate which is used to serialize a
+// frame to a MHTML file.
+class FrameSerializerDelegateImpl final : public FrameSerializer::Delegate {
+  STACK_ALLOCATED();
+
+ public:
+  // Returns a Content-ID to be used for the given frame.
+  // See rfc2557 - section 8.3 - "Use of the Content-ID header and CID URLs".
+  // Format note - the returned string should be of the form "<foo@bar.com>"
+  // (i.e. the strings should include the angle brackets).
+  static String GetContentID(Frame* frame);
+
+  FrameSerializerDelegateImpl(WebFrameSerializer::MHTMLPartsGenerationDelegate&,
+                              HeapHashSet<WeakMember<const Element>>&);
+  ~FrameSerializerDelegateImpl() override = default;
+
+  // FrameSerializer::Delegate implementation.
+  bool ShouldIgnoreElement(const Element&) override;
+  bool ShouldIgnoreAttribute(const Element&, const Attribute&) override;
+  bool RewriteLink(const Element&, String& rewritten_link) override;
+  bool ShouldSkipResourceWithURL(const KURL&) override;
+  Vector<Attribute> GetCustomAttributes(const Element&) override;
+  std::pair<Node*, Element*> GetAuxiliaryDOMTree(const Element&) const override;
+  bool ShouldCollectProblemMetric() override;
+
+ private:
+  bool ShouldIgnoreHiddenElement(const Element&);
+  bool ShouldIgnoreMetaElement(const Element&);
+  bool ShouldIgnorePopupOverlayElement(const Element&);
+  void GetCustomAttributesForImageElement(const HTMLImageElement&,
+                                          Vector<Attribute>*);
+
+  WebFrameSerializer::MHTMLPartsGenerationDelegate& web_delegate_;
+  HeapHashSet<WeakMember<const Element>>& shadow_template_elements_;
+  bool popup_overlays_skipped_;
+
+  DISALLOW_COPY_AND_ASSIGN(FrameSerializerDelegateImpl);
+};
+
+}  // namespace blink
+
+#endif  // THIRD_PARTY_BLINK_RENDERER_CORE_FRAME_FRAME_SERIALIZER_DELEGATE_IMPL_H_