Add Web Resources usage to chrome://tracing.

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

Index: third_party/WebKit/Source/core/fetch/WebCacheMemoryDumpProvider.cpp
diff --git a/third_party/WebKit/Source/core/fetch/WebCacheMemoryDumpProvider.cpp b/third_party/WebKit/Source/core/fetch/WebCacheMemoryDumpProvider.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..b19ecf39369976e44b47ca9a5f120f8d6a8398d2
--- /dev/null
+++ b/third_party/WebKit/Source/core/fetch/WebCacheMemoryDumpProvider.cpp
@@ -0,0 +1,36 @@
+// Copyright 2015 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.
+
+#include "config.h"
+#include "core/fetch/WebCacheMemoryDumpProvider.h"
+
+#include "core/fetch/MemoryCache.h"
+#include "public/platform/WebMemoryAllocatorDump.h"
+#include "public/platform/WebProcessMemoryDump.h"
+
+namespace blink {
+
+WebCacheMemoryDumpProvider* WebCacheMemoryDumpProvider::instance()
+{
+    DEFINE_STATIC_LOCAL(WebCacheMemoryDumpProvider, instance, ());
+    return &instance;
+}
+
+bool WebCacheMemoryDumpProvider::onMemoryDump(WebMemoryDumpLevelOfDetail levelOfDetail, WebProcessMemoryDump* memoryDump)
+{
+    ASSERT(isMainThread());
+    if (m_memoryCache)
+        m_memoryCache->onMemoryDump(memoryDump);
+    return true;
+}
+
+WebCacheMemoryDumpProvider::WebCacheMemoryDumpProvider()
+{
+}
+
+WebCacheMemoryDumpProvider::~WebCacheMemoryDumpProvider()
+{
+}
+
+} // namespace blink