memory coordinator: Add MemoryCoordinatorClient::OnPurgeMemory()

content/browser/dom_storage/dom_storage_context_wrapper.cc

 // Copyright 2013 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 "content/browser/dom_storage/dom_storage_context_wrapper.h"
 
 #include <string>
 #include <vector>
 
 #include "base/bind.h"
@@ skipping 257 matching lines @@
     base::MemoryPressureListener::MemoryPressureLevel memory_pressure_level) {
   DOMStorageContextImpl::PurgeOption purge_option =
       DOMStorageContextImpl::PURGE_UNOPENED;
   if (memory_pressure_level ==
       base::MemoryPressureListener::MEMORY_PRESSURE_LEVEL_CRITICAL) {
     purge_option = DOMStorageContextImpl::PURGE_AGGRESSIVE;
   }
   PurgeMemory(purge_option);
 }
 
-void DOMStorageContextWrapper::OnMemoryStateChange(base::MemoryState state) {
-  // TODO(hajimehoshi): As OnMemoryStateChange changes the state, we should
-  // adjust the limitation to the amount of cache, DomStroageContextImpl doesn't
-  // have such limitation so far though.
-  switch (state) {
-    case base::MemoryState::NORMAL:
-      // Don't have to purge memory here.
-      break;
-    case base::MemoryState::THROTTLED:
-      // TOOD(hajimehoshi): We don't have throttling 'level' so far. When we
-      // have such value, let's change the argument accroding to the value.
-      PurgeMemory(DOMStorageContextImpl::PURGE_AGGRESSIVE);
-      break;
-    case base::MemoryState::SUSPENDED:
-      // Note that SUSPENDED never occurs in the main browser process so far.
-      // Fall through.
-    case base::MemoryState::UNKNOWN:
-      NOTREACHED();
-      break;
-  }
+void DOMStorageContextWrapper::OnPurgeMemory() {
+  PurgeMemory(DOMStorageContextImpl::PURGE_AGGRESSIVE);
 }
 
 void DOMStorageContextWrapper::PurgeMemory(DOMStorageContextImpl::PurgeOption
     purge_option) {
   context_->task_runner()->PostTask(
       FROM_HERE,
       base::Bind(&DOMStorageContextImpl::PurgeMemory, context_, purge_option));
 }
 
 void DOMStorageContextWrapper::GotMojoLocalStorageUsage(
     GetLocalStorageUsageCallback callback,
     std::vector<LocalStorageUsageInfo> usage) {
   context_->task_runner()->PostShutdownBlockingTask(
       FROM_HERE, DOMStorageTaskRunner::PRIMARY_SEQUENCE,
       base::Bind(&GetLocalStorageUsageHelper, base::Passed(&usage),
                  base::RetainedRef(base::ThreadTaskRunnerHandle::Get()),
                  base::RetainedRef(context_), callback));
 }
 
 }  // namespace content