cc: Put context-loss tests in layer_tree_host_unittest_context.cc

cc/heads_up_display_layer.h

Index: cc/heads_up_display_layer.h
diff --git a/cc/heads_up_display_layer.h b/cc/heads_up_display_layer.h
index 15061c66cb0309929e183791e567894c6e945344..2c97a86e9fe86c86f4755e0f15e5a66ef908e34e 100644
--- a/cc/heads_up_display_layer.h
+++ b/cc/heads_up_display_layer.h
@@ -6,12 +6,13 @@
 #define CC_HEADS_UP_DISPLAY_LAYER_H_
 
 #include "base/memory/scoped_ptr.h"
+#include "cc/cc_export.h"
 #include "cc/font_atlas.h"
 #include "cc/layer.h"
 
 namespace cc {
 
-class HeadsUpDisplayLayer : public Layer {
+class CC_EXPORT HeadsUpDisplayLayer : public Layer {
 public:
     static scoped_refptr<HeadsUpDisplayLayer> create();