Make DOMStorageContextWrapper a client of memory coordinator

content/browser/dom_storage/dom_storage_context_wrapper.cc

Index: content/browser/dom_storage/dom_storage_context_wrapper.cc
diff --git a/content/browser/dom_storage/dom_storage_context_wrapper.cc b/content/browser/dom_storage/dom_storage_context_wrapper.cc
index 9f52d77266e9ed750370a1f307664486fef4aa47..d646ada9754a69be1e49e2209c5dc58ff3300499 100644
--- a/content/browser/dom_storage/dom_storage_context_wrapper.cc
+++ b/content/browser/dom_storage/dom_storage_context_wrapper.cc
@@ -18,6 +18,7 @@
 #include "base/threading/thread_task_runner_handle.h"
 #include "components/filesystem/public/interfaces/directory.mojom.h"
 #include "components/leveldb/public/interfaces/leveldb.mojom.h"
+#include "components/memory_coordinator/browser/memory_coordinator.h"
 #include "content/browser/dom_storage/dom_storage_area.h"
 #include "content/browser/dom_storage/dom_storage_context_impl.h"
 #include "content/browser/dom_storage/dom_storage_task_runner.h"
@@ -284,8 +285,14 @@ DOMStorageContextWrapper::DOMStorageContextWrapper(
           worker_pool->GetNamedSequenceToken("dom_storage_commit"),
           BrowserThread::GetTaskRunnerForThread(BrowserThread::IO).get()));
 
-  memory_pressure_listener_.reset(new base::MemoryPressureListener(
-      base::Bind(&DOMStorageContextWrapper::OnMemoryPressure, this)));
+  auto* memory_coordinator =
+      memory_coordinator::MemoryCoordinator::GetInstance();
+  if (memory_coordinator) {
+    memory_coordinator->RegisterClient(this);
+  } else {
+    memory_pressure_listener_.reset(new base::MemoryPressureListener(
+        base::Bind(&DOMStorageContextWrapper::OnMemoryPressure, this)));
+  }
 }
 
 DOMStorageContextWrapper::~DOMStorageContextWrapper() {}
@@ -395,4 +402,16 @@ void DOMStorageContextWrapper::OnMemoryPressure(
       base::Bind(&DOMStorageContextImpl::PurgeMemory, context_, purge_option));
 }
 
+void DOMStorageContextWrapper::OnMemoryStateChange(
+    memory_coordinator::MemoryState state) {
+  DOMStorageContextImpl::PurgeOption purge_option =
+      DOMStorageContextImpl::PURGE_UNOPENED;
+  if (state == memory_coordinator::MemoryState::SUSPENDED) {
+    purge_option = DOMStorageContextImpl::PURGE_AGGRESSIVE;
+  }
+  context_->task_runner()->PostTask(
+      FROM_HERE,
+      base::Bind(&DOMStorageContextImpl::PurgeMemory, context_, purge_option));
+}
+
 }  // namespace content