Prepare to add more initiator info to CachedResource(Request)

Source/core/dom/ProcessingInstruction.cpp

Index: Source/core/dom/ProcessingInstruction.cpp
diff --git a/Source/core/dom/ProcessingInstruction.cpp b/Source/core/dom/ProcessingInstruction.cpp
index d65ca0f7f96d80453854401a745c80988aba3a19..b64d9446d86969dfe76227f3d73339bfa2b47275 100644
--- a/Source/core/dom/ProcessingInstruction.cpp
+++ b/Source/core/dom/ProcessingInstruction.cpp
@@ -31,6 +31,7 @@
 #include "core/loader/cache/CachedCSSStyleSheet.h"
 #include "core/loader/cache/CachedResourceLoader.h"
 #include "core/loader/cache/CachedResourceRequest.h"
+#include "core/loader/cache/CachedResourceRequestInitiators.h"
 #include "core/loader/cache/CachedXSLStyleSheet.h"
 #include "core/page/Frame.h"
 #include "core/xml/XSLStyleSheet.h"
@@ -156,7 +157,7 @@ void ProcessingInstruction::checkStyleSheet()
             m_loading = true;
             document()->styleSheetCollection()->addPendingSheet();
             
-            CachedResourceRequest request(ResourceRequest(document()->completeURL(href)));
+            CachedResourceRequest request(ResourceRequest(document()->completeURL(href)), cachedResourceRequestInitiators().processinginstruction);
             if (m_isXSL)
                 m_cachedSheet = document()->cachedResourceLoader()->requestXSLStyleSheet(request);
             else