Reland: Add MemoryCoordinatorClient

third_party/WebKit/Source/core/fetch/MemoryCache.cpp

Index: third_party/WebKit/Source/core/fetch/MemoryCache.cpp
diff --git a/third_party/WebKit/Source/core/fetch/MemoryCache.cpp b/third_party/WebKit/Source/core/fetch/MemoryCache.cpp
index d6957b64c424a1f5a1b4b2bb3aceb0568f612ba7..a0e32b720bb59c56287aa3aef0a4ad078a0e7c8e 100644
--- a/third_party/WebKit/Source/core/fetch/MemoryCache.cpp
+++ b/third_party/WebKit/Source/core/fetch/MemoryCache.cpp
@@ -104,6 +104,8 @@ inline MemoryCache::MemoryCache()
 #endif
 {
     MemoryCacheDumpProvider::instance()->setMemoryCache(this);
+    if (ProcessHeap::isLowEndDevice())
+        MemoryCoordinator::instance().registerClient(this);
 #ifdef MEMORY_CACHE_STATS
     const double statsIntervalInSeconds = 15;
     m_statsTimer.startRepeating(statsIntervalInSeconds, BLINK_FROM_HERE);
@@ -127,6 +129,7 @@ DEFINE_TRACE(MemoryCache)
     visitor->trace(m_liveDecodedResources);
     visitor->trace(m_resourceMaps);
     MemoryCacheDumpClient::trace(visitor);
+    MemoryCoordinatorClient::trace(visitor);
 }
 
 KURL MemoryCache::removeFragmentIdentifierIfNeeded(const KURL& originalURL)
@@ -735,6 +738,11 @@ bool MemoryCache::onMemoryDump(WebMemoryDumpLevelOfDetail levelOfDetail, WebProc
     return true;
 }
 
+void MemoryCache::onMemoryPressure(WebMemoryPressureLevel level)
+{
+    pruneAll();
+}
+
 bool MemoryCache::isInSameLRUListForTest(const Resource* x, const Resource* y)
 {
     MemoryCacheEntry* ex = getEntryForResource(x);