4 files changed, 17 insertions, 0 deletions
diff --git a/WebCore/config.h b/WebCore/config.h
index 70f8a20..5c3a48c 100644
--- a/WebCore/config.h
+++ b/WebCore/config.h
@@ -202,6 +202,9 @@
 // apple-touch-icon support in <link> tags
 #define ANDROID_APPLE_TOUCH_ICON
 
+// track changes to the style that may change what is drawn
+#define ANDROID_STYLE_VERSION
+
 // Enable prefetching when specified via the rel element of <link> elements.
 #define ENABLE_LINK_PREFETCH 1
 
diff --git a/WebCore/dom/Document.cpp b/WebCore/dom/Document.cpp
index 9dfe6a3..9ad263c 100644
--- a/WebCore/dom/Document.cpp
+++ b/WebCore/dom/Document.cpp
@@ -371,6 +371,9 @@ Document::Document(Frame* frame, const KURL& url, bool isXHTML, bool isHTML, con
     , m_compatibilityMode(NoQuirksMode)
     , m_compatibilityModeLocked(false)
     , m_domTreeVersion(0)
+#ifdef ANDROID_STYLE_VERSION
+    , m_styleVersion(0)
+#endif
     , m_styleSheets(StyleSheetList::create(this))
     , m_readyState(Complete)
     , m_styleRecalcTimer(this, &Document::styleRecalcTimerFired)
diff --git a/WebCore/dom/Document.h b/WebCore/dom/Document.h
index 1fb7079..25122b5 100644
--- a/WebCore/dom/Document.h
+++ b/WebCore/dom/Document.h
@@ -873,6 +873,11 @@ public:
     void incDOMTreeVersion() { ++m_domTreeVersion; }
     unsigned domTreeVersion() const { return m_domTreeVersion; }
 
+#ifdef ANDROID_STYLE_VERSION
+    void incStyleVersion() { ++m_styleVersion; }
+    unsigned styleVersion() const { return m_styleVersion; }
+#endif
+
     void setDocType(PassRefPtr<DocumentType>);
 
 #if ENABLE(XPATH)
@@ -1164,6 +1169,9 @@ private:
     mutable RefPtr<Element> m_documentElement;
 
     unsigned m_domTreeVersion;
+#ifdef ANDROID_STYLE_VERSION
+    unsigned m_styleVersion;
+#endif
     
     HashSet<NodeIterator*> m_nodeIterators;
     HashSet<Range*> m_ranges;
diff --git a/WebCore/dom/Element.cpp b/WebCore/dom/Element.cpp
index 83e129e..10ba71b 100644
--- a/WebCore/dom/Element.cpp
+++ b/WebCore/dom/Element.cpp
@@ -930,6 +930,9 @@ void Element::recalcStyle(StyleChange change)
 #endif
 
     if ((change > NoChange || needsStyleRecalc())) {
+#ifdef ANDROID_STYLE_VERSION
+        document()->incStyleVersion();
+#endif
         if (hasRareData())
             rareData()->resetComputedStyle();
     }