Architecture for cross-process memory notification suppressing

content/browser/memory/memory_message_filter.cc

Index: content/browser/memory/memory_message_filter.cc
diff --git a/content/browser/memory/memory_message_filter.cc b/content/browser/memory/memory_message_filter.cc
new file mode 100644
index 0000000000000000000000000000000000000000..b386717789ea162798019087a797fc22258c309c
--- /dev/null
+++ b/content/browser/memory/memory_message_filter.cc
@@ -0,0 +1,34 @@
+// 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 "content/browser/memory/memory_message_filter.h"
+
+#include "content/browser/memory/memory_pressure_controller.h"
+#include "content/common/memory_messages.h"
+
+namespace content {
+
+MemoryMessageFilter::MemoryMessageFilter()
+    : BrowserMessageFilter(MemoryMsgStart) {}
+
+MemoryMessageFilter::~MemoryMessageFilter() {}
+
+void MemoryMessageFilter::OnFilterAdded(IPC::Sender* sender) {
+  MemoryPressureController::GetInstance()->OnMemoryMessageFilterAdded(this);
+}
+
+void MemoryMessageFilter::OnChannelClosing() {
+  MemoryPressureController::GetInstance()->OnMemoryMessageFilterRemoved(this);
+}
+
+bool MemoryMessageFilter::OnMessageReceived(const IPC::Message& message) {
+  return false;

[nasko, 2015/09/16 21:18:36]

Why override this method instead of using the default implementation, which is
identical?

[petrcermak, 2015/09/17 15:24:53]

This is necessary becasue the method is pure in BrowserMessageFilter
(https://code.google.com/p/chromium/codesearch#chromium/src/content/public/bro...),
which MemoryMessageFilterSubclasses.

+}
+
+void MemoryMessageFilter::SendSetPressureNotificationsSuppressed(
+    bool suppressed) {
+  Send(new MemoryMsg_SetPressureNotificationsSuppressed(suppressed));
+}
+
+}  // namespace content