Revert "Delete CC."

cc/test/mock_occlusion_tracker.h

Index: cc/test/mock_occlusion_tracker.h
diff --git a/cc/test/mock_occlusion_tracker.h b/cc/test/mock_occlusion_tracker.h
new file mode 100644
index 0000000000000000000000000000000000000000..649eb7634bde19ce003ca3df26fbf592e66d3d0d
--- /dev/null
+++ b/cc/test/mock_occlusion_tracker.h
@@ -0,0 +1,51 @@
+// Copyright 2014 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.
+
+#ifndef CC_TEST_MOCK_OCCLUSION_TRACKER_H_
+#define CC_TEST_MOCK_OCCLUSION_TRACKER_H_
+
+#include "cc/trees/occlusion_tracker.h"
+
+namespace cc {
+
+template <typename LayerType>
+class MockOcclusionTracker : public OcclusionTracker<LayerType> {
+  // This class is used for testing only. It fakes just enough information to
+  // calculate unoccluded content rect and unoccluded contributing surface
+  // content rect. It calls the helper function of occlusion tracker to avoid
+  // DCHECKs since testing environment won't be set up properly to pass those.
+ public:
+  MockOcclusionTracker()
+      : OcclusionTracker<LayerType>(gfx::Rect(0, 0, 1000, 1000)) {
+    typename OcclusionTracker<LayerType>::StackObject stack_obj;
+    OcclusionTracker<LayerType>::stack_.push_back(stack_obj);
+    OcclusionTracker<LayerType>::stack_.push_back(stack_obj);
+  }
+
+  explicit MockOcclusionTracker(const gfx::Rect& screen_scissor_rect)
+      : OcclusionTracker<LayerType>(screen_scissor_rect) {
+    typename OcclusionTracker<LayerType>::StackObject stack_obj;
+    OcclusionTracker<LayerType>::stack_.push_back(stack_obj);
+    OcclusionTracker<LayerType>::stack_.push_back(stack_obj);
+  }
+
+  void set_occluded_target_rect(const gfx::Rect& occluded) {
+    OcclusionTracker<LayerType>::stack_.back().occlusion_from_inside_target =
+        occluded;
+  }
+
+  void set_occluded_target_rect_for_contributing_surface(
+      const gfx::Rect& occluded) {
+    OcclusionTracker<
+        LayerType>::stack_[OcclusionTracker<LayerType>::stack_.size() - 2]
+        .occlusion_from_inside_target = occluded;
+  }
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(MockOcclusionTracker);
+};
+
+}  // namespace cc
+
+#endif  // CC_TEST_MOCK_OCCLUSION_TRACKER_H_