PurgeMemory.

third_party/WebKit/Source/core/dom/StyleEngine.cpp

Index: third_party/WebKit/Source/core/dom/StyleEngine.cpp
diff --git a/third_party/WebKit/Source/core/dom/StyleEngine.cpp b/third_party/WebKit/Source/core/dom/StyleEngine.cpp
index 65d35a495c2bea315b815a173f321f985edba6f6..0a019eb29f34e52f661022f9e00a30cb60c982af 100644
--- a/third_party/WebKit/Source/core/dom/StyleEngine.cpp
+++ b/third_party/WebKit/Source/core/dom/StyleEngine.cpp
@@ -724,6 +724,18 @@ void StyleEngine::setStatsEnabled(bool enabled)
         m_styleResolverStats->reset();
 }
 
+void StyleEngine::purgeMemory(DeviceKind deviceKind)
+{
+    if (m_documentStyleSheetCollection)
+        m_documentStyleSheetCollection->purgeMemory();
+    for (ShadowTreeStyleSheetCollection* collection : m_styleSheetCollectionMap.values())
+        collection->purgeMemory();
+    clearFontCache();
+    clearResolver();
+    m_textToSheetCache.clear();
+    m_sheetToTextCache.clear();
+}
+
 DEFINE_TRACE(StyleEngine)
 {
 #if ENABLE(OILPAN)