Reload image bypassing the cache

Source/core/loader/ImageLoader.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2009, 2010 Apple Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
@@ skipping 82 matching lines @@
             // loader has been GCed, but not yet lazily swept & finalized
             // (when this task's loader reference will be cleared.)
             //
             // Handle this transient condition by explicitly checking here
             // before going ahead with the update operation. Unsafe to do it
             // if so, as the objects that the loader refers to may have been
             // finalized by this time.
             if (Heap::willObjectBeLazilySwept(m_loader))
                 return;
 #endif
-            m_loader->doUpdateFromElement(m_shouldBypassMainWorldCSP, m_updateBehavior);
+            m_loader->doUpdateFromElement(m_shouldBypassMainWorldCSP, m_updateBehavior, false);
         }
     }
 
     void clearLoader()
     {
         m_loader = 0;
     }
 
     WeakPtr<Task> createWeakPtr()
     {
@@ skipping 116 matching lines @@
 }
 
 inline void ImageLoader::enqueueImageLoadingMicroTask(UpdateFromElementBehavior updateBehavior)
 {
     OwnPtr<Task> task = Task::create(this, updateBehavior);
     m_pendingTask = task->createWeakPtr();
     Microtask::enqueueMicrotask(task.release());
     m_loadDelayCounter = IncrementLoadEventDelayCount::create(m_element->document());
 }
 
-void ImageLoader::doUpdateFromElement(BypassMainWorldBehavior bypassBehavior, UpdateFromElementBehavior updateBehavior)
+void ImageLoader::doUpdateFromElement(BypassMainWorldBehavior bypassBehavior, UpdateFromElementBehavior updateBehavior, bool bypassCache)
 {
     // FIXME: According to
     // http://www.whatwg.org/specs/web-apps/current-work/multipage/embedded-content.html#the-img-element:the-img-element-55
     // When "update image" is called due to environment changes and the load fails, onerror should not be called.
     // That is currently not the case.
     //
     // We don't need to call clearLoader here: Either we were called from the
     // task, or our caller updateFromElement cleared the task's loader (and set
     // m_pendingTask to null).
     m_pendingTask.clear();
     // Make sure to only decrement the count when we exit this function
     OwnPtr<IncrementLoadEventDelayCount> loadDelayCounter;
     loadDelayCounter.swap(m_loadDelayCounter);
 
     Document& document = m_element->document();
     if (!document.isActive())
         return;
 
     AtomicString imageSourceURL = m_element->imageSourceURL();
     KURL url = imageSourceToKURL(imageSourceURL);
     ResourcePtr<ImageResource> newImage = 0;
     RefPtrWillBeRawPtr<Element> protectElement(m_element.get());
     if (!url.isNull()) {
         // Unlike raw <img>, we block mixed content inside of <picture> or <img srcset>.
         ResourceLoaderOptions resourceLoaderOptions = ResourceFetcher::defaultResourceOptions();
         ResourceRequest resourceRequest(url);
         resourceRequest.setFetchCredentialsMode(WebURLRequest::FetchCredentialsModeSameOrigin);
+        if (bypassCache)
+            resourceRequest.setCachePolicy(ResourceRequestCachePolicy::ReloadBypassingCache);
         if (isHTMLPictureElement(element()->parentNode()) || !element()->fastGetAttribute(HTMLNames::srcsetAttr).isNull())
             resourceRequest.setRequestContext(WebURLRequest::RequestContextImageSet);
         FetchRequest request(resourceRequest, element()->localName(), resourceLoaderOptions);
         configureRequest(request, bypassBehavior, *m_element, document.clientHintsPreferences());
 
         // Prevent the immediate creation of a ResourceLoader (and therefore a network
         // request) for ImageDocument loads. In this case, the image contents have already
         // been requested as a main resource and ImageDocumentParser will take care of
         // funneling the main resource bytes into the ImageResource.
         if (m_loadingImageDocument) {
@@ skipping 55 matching lines @@
     }
 
     if (LayoutImageResource* imageResource = layoutImageResource())
         imageResource->resetAnimation();
 
     // Only consider updating the protection ref-count of the Element immediately before returning
     // from this function as doing so might result in the destruction of this ImageLoader.
     updatedHasPendingEvent();
 }
 
-void ImageLoader::updateFromElement(UpdateFromElementBehavior updateBehavior)
+void ImageLoader::updateFromElement(UpdateFromElementBehavior updateBehavior, bool bypassCache)
 {
     AtomicString imageSourceURL = m_element->imageSourceURL();
     m_suppressErrorEvents = (updateBehavior == UpdateSizeChanged);
 
     if (updateBehavior == UpdateIgnorePreviousError)
         clearFailedLoadURL();
 
     if (!m_failedLoadURL.isEmpty() && imageSourceURL == m_failedLoadURL)
         return;
 
     // If we have a pending task, we have to clear it -- either we're
     // now loading immediately, or we need to reset the task's state.
     if (m_pendingTask) {
         m_pendingTask->clearLoader();
         m_pendingTask.clear();
     }
 
     KURL url = imageSourceToKURL(imageSourceURL);
     if (shouldLoadImmediately(url)) {
-        doUpdateFromElement(DoNotBypassMainWorldCSP, updateBehavior);
+        doUpdateFromElement(DoNotBypassMainWorldCSP, updateBehavior, bypassCache);
         return;
     }
     // Allow the idiom "img.src=''; img.src='.." to clear down the image before
     // an asynchronous load completes.
     if (imageSourceURL.isEmpty()) {
         ImageResource* image = m_image.get();
         if (image)
             image->removeClient(this);
         m_image = nullptr;
     }
@@ skipping 238 matching lines @@
 #endif
 }
 
 #if ENABLE(OILPAN)
 ImageLoader::ImageLoaderClientRemover::~ImageLoaderClientRemover()
 {
     m_loader.willRemoveClient(m_client);
 }
 #endif
 }