Componentization: make core/dom visible for blink_web and blink_tests.

Source/core/dom/DocumentMarker.h

Index: Source/core/dom/DocumentMarker.h
diff --git a/Source/core/dom/DocumentMarker.h b/Source/core/dom/DocumentMarker.h
index a3c83ad2275362ac499ef451445e24e187454447..83ff889588b3d0cbfa75c4213ea5b05f8469251e 100644
--- a/Source/core/dom/DocumentMarker.h
+++ b/Source/core/dom/DocumentMarker.h
@@ -23,6 +23,7 @@
 #ifndef DocumentMarker_h
 #define DocumentMarker_h
 
+#include "core/CoreExport.h"
 #include "platform/heap/Handle.h"
 #include "wtf/VectorTraits.h"
 #include "wtf/text/WTFString.h"
@@ -35,7 +36,7 @@ class DocumentMarkerDetails;
 // It optionally includes a description that could be displayed in the user interface.
 // It also optionally includes a flag specifying whether the match is active, which is ignored
 // for all types other than type TextMatch.
-class DocumentMarker : public NoBaseWillBeGarbageCollected<DocumentMarker> {
+class CORE_EXPORT DocumentMarker : public NoBaseWillBeGarbageCollected<DocumentMarker> {
 public:
     enum MarkerTypeIndex {
         SpellingMarkerIndex = 0,