Adding blink gc memory dump infrastructure for thread specific dumps.

Source/platform/heap/ThreadState.cpp

Index: Source/platform/heap/ThreadState.cpp
diff --git a/Source/platform/heap/ThreadState.cpp b/Source/platform/heap/ThreadState.cpp
index b478a51002e467856f2553c6408948ab67046969..b725e1b7aa974a1d5e909ec550bc5b7fbfdc7975 100644
--- a/Source/platform/heap/ThreadState.cpp
+++ b/Source/platform/heap/ThreadState.cpp
@@ -878,6 +878,9 @@ void ThreadState::postGC(GCType gcType)
     }
 #endif
 
+    if (gcType == TakeSnapshot)
+        takeSnapshot();
+
     for (int i = 0; i < NumberOfHeaps; i++)
         m_heaps[i]->prepareForSweep();
 
@@ -886,7 +889,6 @@ void ThreadState::postGC(GCType gcType)
     } else if (gcType == GCWithoutSweep) {
         setGCState(LazySweepScheduled);
     } else {
-        takeSnapshot();
         // This unmarks all marked objects and marks all unmarked objects dead.
         makeConsistentForSweeping(gcType);
         // Force setting NoGCScheduled to circumvent checkThread()
@@ -1280,7 +1282,34 @@ void ThreadState::promptlyFreed(size_t gcInfoIndex)
 void ThreadState::takeSnapshot()
 {
     ASSERT(isInGC());
-    // TODO(ssid): Implement this.
+
+#define SNAPSHOT_HEAP(HeapType)                                                                   \
+    {                                                                                             \
+        String allocatorBaseName;                                                                 \
+        if (isMainThread()) {                                                                     \
+            allocatorBaseName = String("blink_gc/thread_main/heaps/" #HeapType);                  \
+        }                                                                                         \
+        else {                                                                                    \
+            allocatorBaseName = String::format("blink_gc/thread_%ld/heaps/" #HeapType, m_thread); \
+        }                                                                                         \
+        m_heaps[HeapType##HeapIndex]->takeSnapshot(allocatorBaseName);                            \
+    }
+
+    SNAPSHOT_HEAP(NormalPage1);
+    SNAPSHOT_HEAP(NormalPage2);
+    SNAPSHOT_HEAP(NormalPage3);
+    SNAPSHOT_HEAP(NormalPage4);
+    SNAPSHOT_HEAP(EagerSweep);
+    SNAPSHOT_HEAP(Vector1);
+    SNAPSHOT_HEAP(Vector2);
+    SNAPSHOT_HEAP(Vector3);
+    SNAPSHOT_HEAP(Vector4);
+    SNAPSHOT_HEAP(InlineVector);
+    SNAPSHOT_HEAP(HashTable);
+    SNAPSHOT_HEAP(LargeObject);
+    FOR_EACH_TYPED_HEAP(SNAPSHOT_HEAP);
+
+#undef SNAPSHOT_HEAP
 }
 
 #if ENABLE(GC_PROFILING)