Adding blink gc memory dump infrastructure for thread specific dumps.

Source/platform/heap/Heap.cpp

 /*
  * Copyright (C) 2013 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 23 matching lines @@
 #include "platform/ScriptForbiddenScope.h"
 #include "platform/Task.h"
 #include "platform/TraceEvent.h"
 #include "platform/heap/CallbackStack.h"
 #include "platform/heap/MarkingVisitor.h"
 #include "platform/heap/PageMemory.h"
 #include "platform/heap/PagePool.h"
 #include "platform/heap/SafePoint.h"
 #include "platform/heap/ThreadState.h"
 #include "public/platform/Platform.h"
+#include "public/platform/WebMemoryAllocatorDump.h"
+#include "public/platform/WebProcessMemoryDump.h"
 #include "wtf/Assertions.h"
 #include "wtf/ContainerAnnotations.h"
 #include "wtf/LeakAnnotations.h"
 #include "wtf/MainThread.h"
 #include "wtf/PageAllocator.h"
 #include "wtf/Partitions.h"
 #include "wtf/PassOwnPtr.h"
 #if ENABLE(GC_PROFILING)
 #include "platform/TracedValue.h"
 #include "wtf/HashMap.h"
@@ skipping 152 matching lines @@
 
     ASSERT(!m_firstUnsweptPage);
     // Add the BaseHeap's pages to the orphanedPagePool.
     for (BasePage* page = m_firstPage; page; page = page->next()) {
         Heap::decreaseAllocatedSpace(page->size());
         Heap::orphanedPagePool()->addOrphanedPage(heapIndex(), page);
     }
     m_firstPage = nullptr;
 }
 
+void BaseHeap::dumpMemoryInto(WebProcessMemoryDump* memoryDump, const String* allocatorBaseName)

[Primiano Tucci (use gerrit), 2015/05/21 18:43:10]

maybe s/allocatorBaseName/dumpBaseName/... or just dumpName, unless you plan to
extend it in the future (I guess that is the case)
ah and const* -> const&

[ssid, 2015/05/22 13:34:06]

Done.

+{
+    // Returns if there is no page used in the heap.
+    if (!m_firstPage)
+        return;

[Primiano Tucci (use gerrit), 2015/05/21 18:43:10]

Hmm I'd much rather prefer that you dump a zero in this case (or you might cause
headaches to Peter's UI)
Which looks like, just remove these two lines and the for () loop will take care
as it is

[ssid, 2015/05/22 13:34:06]

Done.

+
+    size_t pageCount = 0;
+    for (BasePage* page = m_firstPage; page; page = page->next()) {
+        pageCount++;
+    }
+    WebMemoryAllocatorDump* allocatorDump = memoryDump->createMemoryAllocatorDump(*allocatorBaseName);
+    allocatorDump->AddScalar("blink_page_count", "objects", pageCount);
+}
+
 #if ENABLE(ASSERT) || ENABLE(GC_PROFILING)
 BasePage* BaseHeap::findPageFromAddress(Address address)
 {
     for (BasePage* page = m_firstPage; page; page = page->next()) {
         if (page->contains(address))
             return page;
     }
     for (BasePage* page = m_firstUnsweptPage; page; page = page->next()) {
         if (page->contains(address))
             return page;
@@ skipping 2001 matching lines @@
 size_t Heap::s_allocatedObjectSize = 0;
 size_t Heap::s_allocatedSpace = 0;
 size_t Heap::s_markedObjectSize = 0;
 // We don't want to use 0 KB for the initial value because it may end up
 // triggering the first GC of some thread too prematurely.
 size_t Heap::s_estimatedLiveObjectSize = 512 * 1024;
 size_t Heap::s_externalObjectSizeAtLastGC = 0;
 double Heap::s_estimatedMarkingTimePerByte = 0.0;
 
 } // namespace blink