cc: Put context-loss tests in layer_tree_host_unittest_context.cc

cc/test/fake_content_layer.cc

Index: cc/test/fake_content_layer.cc
diff --git a/cc/test/fake_content_layer.cc b/cc/test/fake_content_layer.cc
index f217e936649b77616ff4bbbfac37baddfdddc467..c103b2403e1d621c990773e1fd79e37ddbba5f8b 100644
--- a/cc/test/fake_content_layer.cc
+++ b/cc/test/fake_content_layer.cc
@@ -4,6 +4,9 @@
 
 #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)
@@ -16,6 +19,11 @@ FakeContentLayer::FakeContentLayer(ContentLayerClient* client)
 
 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,
@@ -24,4 +32,9 @@ void FakeContentLayer::update(
   update_count_++;
 }
 
+bool FakeContentLayer::HaveBackingAt(int i, int j) {
+  const PrioritizedResource* resource = resourceAtForTesting(i, j);
+  return resource && resource->haveBackingTexture();
+}
+
 }  // namespace cc