cc: Put context-loss tests in layer_tree_host_unittest_context.cc

cc/test/fake_content_layer.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.h"
 
+#include "cc/prioritized_resource.h"
+#include "cc/test/fake_content_layer_impl.h"
+
 namespace cc {
 
 FakeContentLayer::FakeContentLayer(ContentLayerClient* client)
     : ContentLayer(client),
       update_count_(0) {
   setAnchorPoint(gfx::PointF(0, 0));
   setBounds(gfx::Size(1, 1));
   setIsDrawable(true);
 }
 
 FakeContentLayer::~FakeContentLayer() {}
 
+scoped_ptr<LayerImpl> FakeContentLayer::createLayerImpl(
+    LayerTreeImpl* tree_impl) {
+  return FakeContentLayerImpl::Create(tree_impl, m_layerId).PassAs<LayerImpl>();
+}
+
 void FakeContentLayer::update(
     ResourceUpdateQueue& queue,
     const OcclusionTracker* occlusion,
     RenderingStats& stats) {
   ContentLayer::update(queue, occlusion, stats);
   update_count_++;
 }
 
+bool FakeContentLayer::HaveBackingAt(int i, int j) {
+  const PrioritizedResource* resource = resourceAtForTesting(i, j);
+  return resource && resource->haveBackingTexture();
+}
+
 }  // namespace cc