Add Web Resources usage to chrome://tracing.

third_party/WebKit/Source/platform/SharedBuffer.cpp

 /*
  * Copyright (C) 2006, 2008 Apple Inc. All rights reserved.
  * Copyright (C) Research In Motion Limited 2009-2010. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
  *    documentation and/or other materials provided with the distribution.
  *
  * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR
  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
  * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #include "config.h"
 #include "platform/SharedBuffer.h"
 
+#include "public/platform/WebProcessMemoryDump.h"
 #include "wtf/text/UTF8.h"
 #include "wtf/text/Unicode.h"
 
 #undef SHARED_BUFFER_STATS
 
 #ifdef SHARED_BUFFER_STATS
 #include "public/platform/Platform.h"
 #include "public/platform/WebTaskRunner.h"
 #include "public/platform/WebTraceLocation.h"
 #include "wtf/DataLog.h"
@@ skipping 367 matching lines @@
 {
     mergeSegmentsIntoBuffer();
     m_buffer.unlock();
 }
 
 bool SharedBuffer::isLocked() const
 {
     return m_buffer.isLocked();
 }
 
+void SharedBuffer::onMemoryDump(const String& dumpPrefix, WebProcessMemoryDump* memoryDump) const
+{
+    m_buffer.onMemoryDump(dumpPrefix + "/shared_buffer", memoryDump);

[haraken, 2015/10/14 09:04:07]

if (m_buffer.size()) {
  m_buffer.onMemoryDump(dumpPrefix + "/shared_buffer", memoryDump);
} else {
  ...;
}

?

[ssid, 2015/10/14 12:06:40]

Done.

+
+    if (!m_buffer.size()) {
+        // If there is data in the segments, then it should have been allocated
+        // using fastMalloc.
+        const String dataDumpName = dumpPrefix + "/segments";
+        auto dump = memoryDump->createMemoryAllocatorDump(dataDumpName);
+        dump->AddScalar("size", "bytes", m_size);
+        memoryDump->AddSuballocation(dump->guid(), String(WTF::Partitions::kAllocatedObjectPoolName));
+    }
+}
+
 } // namespace blink