Temporarily introduce ImageResourceInfo::setIsPlaceholder()

third_party/WebKit/Source/core/loader/resource/ImageResource.cpp

Index: third_party/WebKit/Source/core/loader/resource/ImageResource.cpp
diff --git a/third_party/WebKit/Source/core/loader/resource/ImageResource.cpp b/third_party/WebKit/Source/core/loader/resource/ImageResource.cpp
index 1f646e29c5b69c406bc533ef6e73bdc8778b942f..468011deb7ae629f2f155048b3d4854167c1ed1d 100644
--- a/third_party/WebKit/Source/core/loader/resource/ImageResource.cpp
+++ b/third_party/WebKit/Source/core/loader/resource/ImageResource.cpp
@@ -102,6 +102,9 @@ class ImageResource::ImageResourceInfoImpl final
   void decodeError(bool allDataReceived) override {
     m_resource->decodeError(allDataReceived);
   }
+  void setIsPlaceholder(bool isPlaceholder) override {
+    m_resource->m_isPlaceholder = isPlaceholder;
+  }
   void setDecodedSize(size_t size) override {
     m_resource->setDecodedSize(size);
   }