DO NOT COMMIT: Experimental removal of encoded image data

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

Index: third_party/WebKit/Source/core/fetch/ImageResource.cpp
diff --git a/third_party/WebKit/Source/core/fetch/ImageResource.cpp b/third_party/WebKit/Source/core/fetch/ImageResource.cpp
index 9a98251a0e375223dae14098aef57c85805722a0..a15b406c5b15a00548d451f261a76345f65870ec 100644
--- a/third_party/WebKit/Source/core/fetch/ImageResource.cpp
+++ b/third_party/WebKit/Source/core/fetch/ImageResource.cpp
@@ -208,6 +208,18 @@ void ImageResource::destroyDecodedDataIfPossible()
     m_image->destroyDecodedData();
 }
 
+void ImageResource::myPrune()
+{
+    if (!m_image)
+        return;
+    if (hasCacheControlNoStoreHeader())
+        return;
+    if (getStatus() != Resource::Cached)
+        return;
+    // Don't call clearImage(). Observers should be kept.
+    m_image->clear();
+}
+
 void ImageResource::doResetAnimation()
 {
     if (m_image)
@@ -548,6 +560,13 @@ void ImageResource::changedInRect(const blink::Image* image, const IntRect& rect
     notifyObservers(&rect);
 }
 
+void ImageResource::requireReloading(const blink::Image* image)
+{
+    for (auto* observer : m_finishedObservers.asVector()) {
+        observer->requireReloading();
+    }
+}
+
 void ImageResource::onePartInMultipartReceived(const ResourceResponse& response)
 {
     ASSERT(m_multipartParser);