Adding blink gc memory dump infrastructure for thread specific dumps.

Source/platform/heap/Heap.h

Index: Source/platform/heap/Heap.h
diff --git a/Source/platform/heap/Heap.h b/Source/platform/heap/Heap.h
index 3d6a7c5980072a38b68e3e67be2d10c9a6d2e874..25ee1e3b4c288936db6d139017553aee83e40d7b 100644
--- a/Source/platform/heap/Heap.h
+++ b/Source/platform/heap/Heap.h
@@ -95,6 +95,7 @@ class FreePagePool;
 class NormalPageHeap;
 class OrphanedPagePool;
 class PageMemory;
+class WebProcessMemoryDump;
 
 #if ENABLE(GC_PROFILING)
 class TracedValue;
@@ -686,6 +687,7 @@ public:
     virtual ~BaseHeap();
     void cleanupPages();
 
+    void dumpMemory(const String& allocatorBaseName);
 #if ENABLE(ASSERT) || ENABLE(GC_PROFILING)
     BasePage* findPageFromAddress(Address);
 #endif
@@ -995,6 +997,9 @@ public:
     static double estimatedMarkingTime();
     static void reportMemoryUsageHistogram();
 
+    static WebProcessMemoryDump* getLastProcessMemoryDump();

[Primiano Tucci (use gerrit), 2015/05/22 15:50:21]

Hmm I think it would be cleaner if we keep the extra WPMD in the
BlinkGCMemoryDumpProvider, so this file stays cleaner.
In essence you should have
BlinkGCMemoryDumpProvider::getProcessMemoryDumpForLastGC() (no need to make it
static, BlinkGCMemoryDumpProvider is already singleton), and remove these two
lines here.

[ssid, 2015/05/22 17:17:10]

Done.

+    static void clearLastProcessMemoryDump();
+
 private:
     // A RegionTree is a simple binary search tree of PageMemoryRegions sorted
     // by base addresses.
@@ -1035,6 +1040,7 @@ private:
     static size_t s_estimatedLiveObjectSize;
     static size_t s_externalObjectSizeAtLastGC;
     static double s_estimatedMarkingTimePerByte;
+    static WebProcessMemoryDump* s_lastProcessMemoryDump;

[Primiano Tucci (use gerrit), 2015/05/22 15:50:21]

Same here, if you move the WPMD to the GCDumpprovider, this goes away

[ssid, 2015/05/22 17:17:10]

Done.

 
     friend class ThreadState;
 };