PurgeMemory.

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

Index: third_party/WebKit/Source/core/dom/Document.cpp
diff --git a/third_party/WebKit/Source/core/dom/Document.cpp b/third_party/WebKit/Source/core/dom/Document.cpp
index 4d3879f0bf462007b32696b6634d67a7c6243500..dc9467a1d7cdd908e0a7c0ede66887bc3603ea40 100644
--- a/third_party/WebKit/Source/core/dom/Document.cpp
+++ b/third_party/WebKit/Source/core/dom/Document.cpp
@@ -5870,6 +5870,18 @@ void Document::enforceStrictMixedContentChecking()
         frame()->loader().client()->didEnforceStrictMixedContentChecking();
 }
 
+void Document::purgeMemory(DeviceKind deviceKind)
+{
+    m_styleEngine->purgeMemory(deviceKind);
+    if (&axObjectCacheOwner() == this)
+        clearAXObjectCache();
+    if (m_fetcher)
+        m_fetcher->purgeMemory();
+    m_selectorQueryCache.clear();
+    m_canvasFontCache.clear();
+    m_mediaQueryMatcher.clear();
+}
+
 DEFINE_TRACE(Document)
 {
 #if ENABLE(OILPAN)