Add Web Resources usage to chrome://tracing.

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

Index: third_party/WebKit/Source/core/fetch/ScriptResource.cpp
diff --git a/third_party/WebKit/Source/core/fetch/ScriptResource.cpp b/third_party/WebKit/Source/core/fetch/ScriptResource.cpp
index 347de8c64735c7c9973b08253083e3c32f3f3d9b..1b47d0854460c01c5bf038cf904b00d8326b61c9 100644
--- a/third_party/WebKit/Source/core/fetch/ScriptResource.cpp
+++ b/third_party/WebKit/Source/core/fetch/ScriptResource.cpp
@@ -33,6 +33,7 @@
 #include "platform/MIMETypeRegistry.h"
 #include "platform/SharedBuffer.h"
 #include "platform/network/HTTPParsers.h"
+#include "public/platform/WebProcessMemoryDump.h"
 
 namespace blink {
 
@@ -72,6 +73,15 @@ void ScriptResource::appendData(const char* data, unsigned length)
         client->notifyAppendData(this);
 }
 
+void ScriptResource::onMemoryDump(WebProcessMemoryDump* memoryDump) const

[haraken, 2015/09/28 14:54:02]

Why do you specialize for ScriptResource (while you don't specialize for other
Resources)?

[ssid, 2015/09/28 16:24:38]

Ah because the Scripts keep count of the decoded scripts as live resources, and
this is not considered as decoded since the cache should not purge it. Also all
the other resources store the raw data in "m_data", but the script resources use
extra memory. That is why special case. If there are more special cases like
this I will update in future, adding more.

+{
+    Resource::onMemoryDump(memoryDump);
+    const String name = getMemoryDumpName() + "/decoded_script";
+    auto dump = memoryDump->createMemoryAllocatorDump(name);
+    dump->AddScalar("size", "bytes", m_script.string().sizeInBytes());
+    memoryDump->AddSuballocation(dump->guid(), String(WTF::Partitions::allocatorPoolNameForTracing()));
+}
+
 AtomicString ScriptResource::mimeType() const
 {
     return extractMIMETypeFromMediaType(m_response.httpHeaderField("Content-Type")).lower();