Aura/ÜC: Drop frames on background tabs

content/browser/renderer_host/delegated_frame_evictor.cc

Index: content/browser/renderer_host/delegated_frame_evictor.cc
diff --git a/content/browser/renderer_host/delegated_frame_evictor.cc b/content/browser/renderer_host/delegated_frame_evictor.cc
new file mode 100644
index 0000000000000000000000000000000000000000..8fb51c40d7a110a35b8ed068e7cea021cbbebdb9
--- /dev/null
+++ b/content/browser/renderer_host/delegated_frame_evictor.cc
@@ -0,0 +1,34 @@
+// Copyright (c) 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/renderer_host/delegated_frame_evictor.h"
+
+namespace content {
+
+DelegatedFrameEvictor::DelegatedFrameEvictor(
+    DelegatedFrameEvictorClient* client)
+    : client_(client), has_frame_(false) {}
+
+DelegatedFrameEvictor::~DelegatedFrameEvictor() { DiscardedFrame(); }
+
+void DelegatedFrameEvictor::SwappedFrame(bool visible) {
+  has_frame_ = true;
+  RendererFrameManager::GetInstance()->AddFrame(this, visible);
+}
+
+void DelegatedFrameEvictor::DiscardedFrame() {
+  RendererFrameManager::GetInstance()->RemoveFrame(this);
+  has_frame_ = false;
+}
+
+void DelegatedFrameEvictor::SetVisible(bool visible) {
+  if (has_frame_)
+    RendererFrameManager::GetInstance()->SetFrameVisibility(this, visible);
+}
+
+void DelegatedFrameEvictor::EvictCurrentFrame() {
+  client_->EvictDelegatedFrame();
+}
+
+}  // namespace content