Decouple memory() from Console

Source/core/timing/ConsoleMemory.cpp

Index: Source/core/timing/ConsoleMemory.cpp
diff --git a/Source/core/timing/ConsoleMemory.cpp b/Source/core/timing/ConsoleMemory.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..e2bc1307f8ce119294ec1cd06f23afbac1ff391d
--- /dev/null
+++ b/Source/core/timing/ConsoleMemory.cpp
@@ -0,0 +1,46 @@
+// 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/timing/ConsoleMemory.h"
+
+#include "core/frame/Console.h"
+#include "core/timing/MemoryInfo.h"
+
+namespace blink {
+
+DEFINE_EMPTY_DESTRUCTOR_WILL_BE_REMOVED(ConsoleMemory);
+
+DEFINE_TRACE(ConsoleMemory)
+{
+    visitor->trace(m_memory);
+    WillBeHeapSupplement<Console>::trace(visitor);
+}
+
+// static
+ConsoleMemory& ConsoleMemory::from(Console& console)
+{
+    ConsoleMemory* supplement = static_cast<ConsoleMemory*>(WillBeHeapSupplement<Console>::from(console, supplementName()));
+    if (!supplement) {
+        supplement = new ConsoleMemory();
+        provideTo(console, supplementName(), adoptPtrWillBeNoop(supplement));
+    }
+    return *supplement;
+}
+
+// static
+MemoryInfo* ConsoleMemory::memory(Console& console)
+{
+    return ConsoleMemory::from(console).memory();
+}
+
+MemoryInfo* ConsoleMemory::memory()
+{
+    if (!m_memory)
+        m_memory = MemoryInfo::create();
+
+    return m_memory.get();

[sof, 2015/07/13 14:02:48]

Sharing MemoryInfo across accesses is subtly incorrect, as it will report
immutable heap values. Switching back to previous via
https://codereview.chromium.org/1230203003/

+}
+
+} // namespace blink