Make DOMStorageContextWrapper a client of memory coordinator

content/browser/dom_storage/dom_storage_context_wrapper.h

Index: content/browser/dom_storage/dom_storage_context_wrapper.h
diff --git a/content/browser/dom_storage/dom_storage_context_wrapper.h b/content/browser/dom_storage/dom_storage_context_wrapper.h
index 701324850accb5570bacdd80feabc529dc074dbb..c75976cd8e0f70a2cb197106f2ea103f593f850b 100644
--- a/content/browser/dom_storage/dom_storage_context_wrapper.h
+++ b/content/browser/dom_storage/dom_storage_context_wrapper.h
@@ -11,6 +11,7 @@
 #include "base/macros.h"
 #include "base/memory/memory_pressure_listener.h"
 #include "base/memory/ref_counted.h"
+#include "components/memory_coordinator/common/memory_coordinator_client.h"
 #include "content/common/content_export.h"
 #include "content/common/storage_partition_service.mojom.h"
 #include "content/public/browser/dom_storage_context.h"
@@ -37,6 +38,7 @@ class LevelDBWrapperImpl;
 // state.
 class CONTENT_EXPORT DOMStorageContextWrapper :
     NON_EXPORTED_BASE(public DOMStorageContext),
+    public memory_coordinator::MemoryCoordinatorClient,
     public base::RefCountedThreadSafe<DOMStorageContextWrapper> {
  public:
   // If |data_path| is empty, nothing will be saved to disk.
@@ -78,6 +80,9 @@ class CONTENT_EXPORT DOMStorageContextWrapper :
   void OnMemoryPressure(
       base::MemoryPressureListener::MemoryPressureLevel memory_pressure_level);
 
+  // memory_coordinator::MemoryCoordinatorClient implementation.
+  void OnMemoryStateChange(memory_coordinator::MemoryState state) override;
+
  private:
   friend class DOMStorageMessageFilter;  // for access to context()
   friend class SessionStorageNamespaceImpl;  // ditto