cc: Put context-loss tests in layer_tree_host_unittest_context.cc

cc/test/fake_content_layer_impl.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_content_layer_impl.h"
+
+namespace cc {
+
+FakeContentLayerImpl::FakeContentLayerImpl(LayerTreeImpl* tree_impl, int id)
+    : TiledLayerImpl(tree_impl, id),
+      lost_output_surface_count_(0) {
+}
+
+FakeContentLayerImpl::~FakeContentLayerImpl() {}
+
+bool FakeContentLayerImpl::HaveResourceForTileAt(int i, int j) {
+  return hasResourceIdForTileAt(i, j);
+}
+
+void FakeContentLayerImpl::didLoseOutputSurface() {
+  ++lost_output_surface_count_;
+}
+
+}  // namespace cc