Add Blink support for showing image placeholders using range requests.

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

Index: third_party/WebKit/Source/core/fetch/FetchRequest.cpp
diff --git a/third_party/WebKit/Source/core/fetch/FetchRequest.cpp b/third_party/WebKit/Source/core/fetch/FetchRequest.cpp
index 952e4d42a6954ad986d6f628e54ff29326e327b9..31d5ed66a93c2933deba09af3c6566ca971bdff5 100644
--- a/third_party/WebKit/Source/core/fetch/FetchRequest.cpp
+++ b/third_party/WebKit/Source/core/fetch/FetchRequest.cpp
@@ -40,7 +40,8 @@ FetchRequest::FetchRequest(const ResourceRequest& resourceRequest,
       m_linkPreload(false),
       m_preloadDiscoveryTime(0.0),
       m_defer(NoDefer),
-      m_originRestriction(UseDefaultOriginRestrictionForType) {
+      m_originRestriction(UseDefaultOriginRestrictionForType),
+      m_placeholderImageRequestType(DisallowPlaceholder) {
   m_options.initiatorInfo.name = initiator;
 }
 
@@ -53,7 +54,9 @@ FetchRequest::FetchRequest(const ResourceRequest& resourceRequest,
       m_linkPreload(false),
       m_preloadDiscoveryTime(0.0),
       m_defer(NoDefer),
-      m_originRestriction(UseDefaultOriginRestrictionForType) {
+      m_originRestriction(UseDefaultOriginRestrictionForType),
+      m_placeholderImageRequestType(
+          PlaceholderImageRequestType::DisallowPlaceholder) {
   m_options.initiatorInfo.name = initiator;
 }
 
@@ -65,7 +68,9 @@ FetchRequest::FetchRequest(const ResourceRequest& resourceRequest,
       m_linkPreload(false),
       m_preloadDiscoveryTime(0.0),
       m_defer(NoDefer),
-      m_originRestriction(UseDefaultOriginRestrictionForType) {
+      m_originRestriction(UseDefaultOriginRestrictionForType),
+      m_placeholderImageRequestType(
+          PlaceholderImageRequestType::DisallowPlaceholder) {
   m_options.initiatorInfo = initiator;
 }