Adds tracing to MHTML generation call chain.

third_party/WebKit/Source/web/WebFrameSerializer.cpp

 /*
  * Copyright (C) 2009 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 27 matching lines @@
 #include "core/frame/LocalFrame.h"
 #include "core/frame/RemoteFrame.h"
 #include "core/html/HTMLAllCollection.h"
 #include "core/html/HTMLFrameElementBase.h"
 #include "core/html/HTMLFrameOwnerElement.h"
 #include "core/html/HTMLInputElement.h"
 #include "core/html/HTMLTableElement.h"
 #include "core/loader/DocumentLoader.h"
 #include "platform/SerializedResource.h"
 #include "platform/SharedBuffer.h"
+#include "platform/TraceEvent.h"
 #include "platform/mhtml/MHTMLArchive.h"
 #include "platform/mhtml/MHTMLParser.h"
 #include "platform/network/ResourceRequest.h"
 #include "platform/network/ResourceResponse.h"
 #include "platform/weborigin/KURL.h"
 #include "public/platform/WebString.h"
 #include "public/platform/WebURL.h"
 #include "public/platform/WebURLResponse.h"
 #include "public/platform/WebVector.h"
 #include "public/web/WebDataSource.h"
@@ skipping 115 matching lines @@
         return true;
 
     return !cacheControlNoStoreHeaderPresent(*webLocalFrameImpl);
 }
 
 } // namespace
 
 WebData WebFrameSerializer::generateMHTMLHeader(
     const WebString& boundary, WebLocalFrame* frame, MHTMLPartsGenerationDelegate* delegate)
 {
+    TRACE_EVENT0("page-serialization", "WebFrameSerializer::generateMHTMLHeader");
     DCHECK(frame);
     DCHECK(delegate);
 
     if (!frameShouldBeSerializedAsMHTML(frame, delegate->cacheControlPolicy()))
         return WebData();
 
     WebLocalFrameImpl* webLocalFrameImpl = toWebLocalFrameImpl(frame);
     DCHECK(webLocalFrameImpl);
 
     Document* document = webLocalFrameImpl->frame()->document();
 
     RefPtr<SharedBuffer> buffer = SharedBuffer::create();
     MHTMLArchive::generateMHTMLHeader(
         boundary, document->title(), document->suggestedMIMEType(),
         *buffer);
     return buffer.release();
 }
 
 WebData WebFrameSerializer::generateMHTMLParts(
     const WebString& boundary, WebLocalFrame* webFrame, MHTMLPartsGenerationDelegate* webDelegate)
 {
+    TRACE_EVENT0("page-serialization", "WebFrameSerializer::generateMHTMLParts");
     DCHECK(webFrame);
     DCHECK(webDelegate);
 
     if (!frameShouldBeSerializedAsMHTML(webFrame, webDelegate->cacheControlPolicy()))
         return WebData();
 
     // Translate arguments from public to internal blink APIs.
     LocalFrame* frame = toWebLocalFrameImpl(webFrame)->frame();
     MHTMLArchive::EncodingPolicy encodingPolicy = webDelegate->useBinaryEncoding()
         ? MHTMLArchive::EncodingPolicy::UseBinaryEncoding
         : MHTMLArchive::EncodingPolicy::UseDefaultEncoding;
 
     // Serialize.
     Vector<SerializedResource> resources;
+    TRACE_EVENT_BEGIN0("page-serialization", "WebFrameSerializer::generateMHTMLParts serializing");
     MHTMLFrameSerializerDelegate coreDelegate(*webDelegate);
     FrameSerializer serializer(resources, coreDelegate);
     serializer.serializeFrame(*frame);
+    TRACE_EVENT_END1("page-serialization", "WebFrameSerializer::generateMHTMLParts serializing",
+        "resource count", static_cast<unsigned long long>(resources.size()));
 
     // Get Content-ID for the frame being serialized.
     String frameContentID = webDelegate->getContentID(webFrame);
 
     // Encode serializer's output as MHTML.
     RefPtr<SharedBuffer> output = SharedBuffer::create();
     bool isFirstResource = true;
     for (const SerializedResource& resource : resources) {
+        TRACE_EVENT0("page-serialization", "WebFrameSerializer::generateMHTMLParts encoding");
         // Frame is the 1st resource (see FrameSerializer::serializeFrame doc
         // comment). Frames get a Content-ID header.
         String contentID = isFirstResource ? frameContentID : String();
 
         MHTMLArchive::generateMHTMLPart(
             boundary, contentID, encodingPolicy, resource, *output);
 
         isFirstResource = false;
     }
     return output.release();
 }
 
 WebData WebFrameSerializer::generateMHTMLFooter(const WebString& boundary)
 {
+    TRACE_EVENT0("page-serialization", "WebFrameSerializer::generateMHTMLFooter");
     RefPtr<SharedBuffer> buffer = SharedBuffer::create();
     MHTMLArchive::generateMHTMLFooter(boundary, *buffer);
     return buffer.release();
 }
 
 bool WebFrameSerializer::serialize(
     WebLocalFrame* frame,
     WebFrameSerializerClient* client,
     WebFrameSerializer::LinkRewritingDelegate* delegate)
 {
@@ skipping 20 matching lines @@
 WebString WebFrameSerializer::generateBaseTagDeclaration(const WebString& baseTarget)
 {
     // TODO(yosin) We should call |FrameSerializer::baseTagDeclarationOf()|.
     if (baseTarget.isEmpty())
         return String("<base href=\".\">");
     String baseString = "<base href=\".\" target=\"" + static_cast<const String&>(baseTarget) + "\">";
     return baseString;
 }
 
 } // namespace blink