cc: Put context-loss tests in layer_tree_host_unittest_context.cc

cc/test/fake_video_frame_provider.cc

+// Copyright 2012 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 "cc/test/fake_video_frame_provider.h"
+
+namespace cc {
+
+FakeVideoFrameProvider::FakeVideoFrameProvider()
+    : frame_(NULL), client_(NULL) {}
+
+FakeVideoFrameProvider::~FakeVideoFrameProvider() {
+  if (client_)
+    client_->stopUsingProvider();
+}
+
+void FakeVideoFrameProvider::setVideoFrameProviderClient(Client* client) {
+  client_ = client;
+}
+
+WebKit::WebVideoFrame* FakeVideoFrameProvider::getCurrentFrame() {
+  return frame_;
+}
+
+}  // namespace cc