Move cc::DisplayItemList and related classes into cc/paint/

cc/debug/picture_debug_util.h

Index: cc/debug/picture_debug_util.h
diff --git a/cc/debug/picture_debug_util.h b/cc/debug/picture_debug_util.h
index 1719ea27632894b51a6ac0627fa4bd66e4487ff6..3c149c22b8a51989b2018d0744e6ebdc21e4fc28 100644
--- a/cc/debug/picture_debug_util.h
+++ b/cc/debug/picture_debug_util.h
@@ -7,11 +7,13 @@
 
 #include <string>
 
+#include "cc/debug/debug_export.h"
+
 class SkPicture;
 
 namespace cc {
 
-class PictureDebugUtil {
+class CC_DEBUG_EXPORT PictureDebugUtil {
  public:
   static void SerializeAsBase64(const SkPicture* picture, std::string* output);
 };