Move frame eviction into components

components/viz/frame_sinks/frame_evictor.cc

Index: components/viz/frame_sinks/frame_evictor.cc
diff --git a/components/viz/frame_sinks/frame_evictor.cc b/components/viz/frame_sinks/frame_evictor.cc
new file mode 100644
index 0000000000000000000000000000000000000000..0207423adce69af8d7497204c89b57789286b79c
--- /dev/null
+++ b/components/viz/frame_sinks/frame_evictor.cc
@@ -0,0 +1,56 @@
+// Copyright 2017 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 "components/viz/frame_sinks/frame_evictor.h"
+
+#include "base/logging.h"
+
+namespace viz {
+
+FrameEvictor::FrameEvictor(FrameEvictorClient* client)
+    : client_(client), has_frame_(false), visible_(false) {}
+
+FrameEvictor::~FrameEvictor() {
+  DiscardedFrame();
+}
+
+void FrameEvictor::SwappedFrame(bool visible) {
+  visible_ = visible;
+  has_frame_ = true;
+  FrameEvictionManager::GetInstance()->AddFrame(this, visible);
+}
+
+void FrameEvictor::DiscardedFrame() {
+  FrameEvictionManager::GetInstance()->RemoveFrame(this);
+  has_frame_ = false;
+}
+
+void FrameEvictor::SetVisible(bool visible) {
+  if (visible_ == visible)
+    return;
+  visible_ = visible;
+  if (has_frame_) {
+    if (visible) {
+      LockFrame();
+    } else {
+      UnlockFrame();
+    }
+  }
+}
+
+void FrameEvictor::LockFrame() {
+  DCHECK(has_frame_);
+  FrameEvictionManager::GetInstance()->LockFrame(this);
+}
+
+void FrameEvictor::UnlockFrame() {
+  DCHECK(has_frame_);
+  FrameEvictionManager::GetInstance()->UnlockFrame(this);
+}
+
+void FrameEvictor::EvictCurrentFrame() {
+  client_->EvictDelegatedFrame();
+}
+
+}  // namespace viz