Provide renderers with memory pressure signals.

content/public/browser/memory_pressure_controller.cc

+// Copyright 2016 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/public/browser/memory_pressure_controller.h"
+
+#include "content/browser/memory/memory_pressure_controller_impl.h"
+
+namespace content {
+
+// static
+void MemoryPressureController::SendPressureNotification(
+    const BrowserChildProcessHost* child_process_host,
+    base::MemoryPressureListener::MemoryPressureLevel level) {
+  MemoryPressureControllerImpl::GetInstance()->SendPressureNotification(
+      child_process_host, level);
+}
+
+// static
+void MemoryPressureController::SendPressureNotification(
+    const RenderProcessHost* render_process_host,
+    base::MemoryPressureListener::MemoryPressureLevel level) {
+  MemoryPressureControllerImpl::GetInstance()->SendPressureNotification(
+      render_process_host, level);
+}
+
+}  // namespace content