Temporarily introduce ImageResourceInfo::setIsPlaceholder()

third_party/WebKit/Source/core/loader/resource/ImageResourceInfo.h

Index: third_party/WebKit/Source/core/loader/resource/ImageResourceInfo.h
diff --git a/third_party/WebKit/Source/core/loader/resource/ImageResourceInfo.h b/third_party/WebKit/Source/core/loader/resource/ImageResourceInfo.h
index fa2c4252785c98ecb389dd7819e52de345ce312e..e78dbb505981e42ed0085c74a18801972038e050 100644
--- a/third_party/WebKit/Source/core/loader/resource/ImageResourceInfo.h
+++ b/third_party/WebKit/Source/core/loader/resource/ImageResourceInfo.h
@@ -50,6 +50,9 @@ class CORE_EXPORT ImageResourceInfo : public GarbageCollectedMixin {
   // (if any) DecodeError and finishes loading.
   virtual void decodeError(bool allDataReceived) = 0;
 
+  // TODO(hiroshige): Remove this.
+  virtual void setIsPlaceholder(bool) = 0;
+
   // TODO(hiroshige): Remove this once MemoryCache becomes further weaker.
   virtual void setDecodedSize(size_t) = 0;