Allow eviction of ImageBitmaps that are created from ImageElements.

Source/core/loader/cache/CachedResource.cpp

Index: Source/core/loader/cache/CachedResource.cpp
diff --git a/Source/core/loader/cache/CachedResource.cpp b/Source/core/loader/cache/CachedResource.cpp
index e981ad4deae249553e3ac14940b419d9f6bb82f7..013fe807352be4cbe6303df5261c03a9d7a09c70 100644
--- a/Source/core/loader/cache/CachedResource.cpp
+++ b/Source/core/loader/cache/CachedResource.cpp
@@ -119,6 +119,7 @@ CachedResource::CachedResource(const ResourceRequest& request, Type type)
     , m_handleCount(0)
     , m_preloadCount(0)
     , m_preloadResult(PreloadNotReferenced)
+    , m_decodePriority(DecodePriorityLow)
     , m_inLiveDecodedResourcesList(false)
     , m_requestedFromNetworkingLayer(false)
     , m_inCache(false)
@@ -355,6 +356,19 @@ CachedMetadata* CachedResource::cachedMetadata(unsigned dataTypeID) const
     return m_cachedMetadata.get();
 }
 
+void CachedResource::setDecodePriority(DecodePriority priority)
+{
+    m_lastDecodedAccessTime = currentTime();
+    if (inCache()) {
+        if (m_inLiveDecodedResourcesList && m_decodePriority != priority) {
+            memoryCache()->removeFromLiveDecodedResourcesList(this);
+            m_decodePriority = priority;
+            memoryCache()->insertInLiveDecodedResourcesList(this);
+        }
+        memoryCache()->prune();
+    }
+}
+
 void CachedResource::clearLoader()
 {
     m_loader = 0;
@@ -551,7 +565,6 @@ void CachedResource::setEncodedSize(unsigned size)
 void CachedResource::didAccessDecodedData(double timeStamp)
 {
     m_lastDecodedAccessTime = timeStamp;
-    

[Justin Novosad, 2013/07/23 16:55:12]

Don't do whitespace edits unless you are changing the immediately surrounding
code.

     if (inCache()) {
         if (m_inLiveDecodedResourcesList) {
             memoryCache()->removeFromLiveDecodedResourcesList(this);
@@ -881,3 +894,4 @@ void CachedResource::reportMemoryUsage(MemoryObjectInfo* memoryObjectInfo) const
         info.addRawBuffer(m_purgeableData.get(), m_purgeableData->size(), "PurgeableData", "purgeableData");
 }
 }
+