Add Web Resources usage to chrome://tracing.

third_party/WebKit/Source/core/fetch/ScriptResource.cpp

 /*
     Copyright (C) 1998 Lars Knoll (knoll@mpi-hd.mpg.de)
     Copyright (C) 2001 Dirk Mueller (mueller@kde.org)
     Copyright (C) 2002 Waldo Bastian (bastian@kde.org)
     Copyright (C) 2006 Samuel Weinig (sam.weinig@gmail.com)
     Copyright (C) 2004, 2005, 2006, 2007, 2008 Apple Inc. All rights reserved.
 
     This library is free software; you can redistribute it and/or
     modify it under the terms of the GNU Library General Public
     License as published by the Free Software Foundation; either
@@ skipping 15 matching lines @@
 
 #include "config.h"
 #include "core/fetch/ScriptResource.h"
 
 #include "core/fetch/FetchRequest.h"
 #include "core/fetch/ResourceClientWalker.h"
 #include "core/fetch/ResourceFetcher.h"
 #include "platform/MIMETypeRegistry.h"
 #include "platform/SharedBuffer.h"
 #include "platform/network/HTTPParsers.h"
+#include "public/platform/WebProcessMemoryDump.h"
 
 namespace blink {
 
 ResourcePtr<ScriptResource> ScriptResource::fetch(FetchRequest& request, ResourceFetcher* fetcher)
 {
     ASSERT(request.resourceRequest().frameType() == WebURLRequest::FrameTypeNone);
     request.mutableResourceRequest().setRequestContext(WebURLRequest::RequestContextScript);
     return toScriptResource(fetcher->requestResource(request, ScriptResourceFactory()));
 }
 
@@ skipping 19 matching lines @@
 }
 
 void ScriptResource::appendData(const char* data, unsigned length)
 {
     Resource::appendData(data, length);
     ResourceClientWalker<ScriptResourceClient> walker(m_clients);
     while (ScriptResourceClient* client = walker.next())
         client->notifyAppendData(this);
 }
 
+void ScriptResource::onMemoryDump(WebProcessMemoryDump* memoryDump) const
+{
+    Resource::onMemoryDump(memoryDump);
+    const String name = getMemoryDumpName() + "/decoded_script";
+    auto dump = memoryDump->createMemoryAllocatorDump(name);
+    dump->AddScalar("size", "bytes", m_script.string().sizeInBytes());

[haraken, 2015/09/29 02:44:48]

Just to confirm: You're special-casing ScriptResource because m_script is one of
the big memory consumers (i.e., this is not related to dumping memory of
Resources), right? That makes sense to me.

[ssid, 2015/09/29 11:06:37]

Yes, it was using extra memory(considerable) apart from the normal resource
encoded_size. So, the special case.

+    memoryDump->AddSuballocation(dump->guid(), String(WTF::Partitions::allocatorPoolNameForTracing()));
+}
+
 AtomicString ScriptResource::mimeType() const
 {
     return extractMIMETypeFromMediaType(m_response.httpHeaderField("Content-Type")).lower();
 }
 
 const String& ScriptResource::script()
 {
     ASSERT(!isPurgeable());
     ASSERT(isLoaded());
 
     if (!m_script && m_data) {
         String script = decodedText();
         m_data.clear();
         // We lie a it here and claim that script counts as encoded data (even though it's really decoded data).
         // That's because the MemoryCache thinks that it can clear out decoded data by calling destroyDecodedData(),
         // but we can't destroy script in destroyDecodedData because that's our only copy of the data!
         setEncodedSize(script.sizeInBytes());
         m_script = AtomicString(script);
     }
 
     return m_script.string();
 }
 
 bool ScriptResource::mimeTypeAllowedByNosniff() const
 {
     return parseContentTypeOptionsHeader(m_response.httpHeaderField("X-Content-Type-Options")) != ContentTypeOptionsNosniff || MIMETypeRegistry::isSupportedJavaScriptMIMEType(mimeType());
 }
 
 } // namespace blink