Add a WebDocument::watchCssSelectors(selectors)

Source/core/dom/CSSSelectorWatch.h

Index: Source/core/dom/CSSSelectorWatch.h
diff --git a/Source/modules/donottrack/NavigatorDoNotTrack.h b/Source/core/dom/CSSSelectorWatch.h
similarity index 51%
copy from Source/modules/donottrack/NavigatorDoNotTrack.h
copy to Source/core/dom/CSSSelectorWatch.h
index 0c044e7cd8edef2f8860c374d59f077e1e963816..abaca558b4d40c5a4e5f96089dac5471a78ce5fb 100644
--- a/Source/modules/donottrack/NavigatorDoNotTrack.h
+++ b/Source/core/dom/CSSSelectorWatch.h
@@ -28,32 +28,61 @@
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
-#ifndef NavigatorDoNotTrack_h
-#define NavigatorDoNotTrack_h
+#ifndef CSSSelectorWatch_h
+#define CSSSelectorWatch_h
 
-#include "core/page/DOMWindowProperty.h"
 #include "core/platform/Supplementable.h"
+#include "core/platform/Timer.h"
+#include "wtf/HashSet.h"
+#include "wtf/RefPtr.h"
+#include "wtf/Vector.h"
+#include "wtf/WeakPtr.h"
 #include "wtf/text/WTFString.h"
 
 namespace WebCore {
 
-class Frame;
-class Navigator;
+class Document;
+class ScriptExecutionContext;
+class StyleRule;
+class StyleRareNonInheritedData;
 
-class NavigatorDoNotTrack : public Supplement<Navigator>, public DOMWindowProperty {
+class CSSSelectorWatch : public Supplement<ScriptExecutionContext> {
 public:
-    virtual ~NavigatorDoNotTrack();
-    static NavigatorDoNotTrack* from(Navigator*);
+    virtual ~CSSSelectorWatch();
 
-    static String doNotTrack(Navigator*);
+    static CSSSelectorWatch* from(Document*);
 
-    String doNotTrack();
+    void watchCSSSelectors(const Vector<String>& selectors);
+    const Vector<RefPtr<StyleRule> >& watchedCallbackSelectors() const { return m_watchedCallbackSelectors; }
+
+    void addSelectorMatch(const String& selector, StyleRareNonInheritedData*);
+    void removeSelectorMatch(const String& selector);
+
+private:
+    // Runs FrameLoaderClient::selectorMatchChanged with the updated value of
+    // m_callbackSelectorChange.
+    void callbackSelectorChangeTimerFired(Timer<CSSSelectorWatch>*);
+
+    Document* const m_document;
+
+    Vector<RefPtr<StyleRule> > m_watchedCallbackSelectors;
+
+    // Maps a CSS selector string with a -webkit-callback property to the number
+    // of matching RenderStyle objects in this document.
+    HashMap<String, int> m_matchingCallbackSelectors;
+    // Selectors are relative to m_matchingCallbackSelectors's contents at
+    // the previous call to selectorMatchChanged.
+    HashSet<String> m_addedSelectors;
+    HashSet<String> m_removedSelectors;
+
+    Timer<CSSSelectorWatch> m_callbackSelectorChangeTimer;
+
+    WeakPtrFactory<CSSSelectorWatch> m_weakThisFactory;
 
 private:
-    explicit NavigatorDoNotTrack(Frame*);
-    static const char* supplementName();
+    CSSSelectorWatch(Document*);
 };
 
 } // namespace WebCore
 
-#endif // NavigatorDoNotTrack_h
+#endif // CSSSelectorWatch_h