Distinguish between subresource filtering and dryrun matching.

third_party/WebKit/Source/core/loader/FrameFetchContext.cpp

Index: third_party/WebKit/Source/core/loader/FrameFetchContext.cpp
diff --git a/third_party/WebKit/Source/core/loader/FrameFetchContext.cpp b/third_party/WebKit/Source/core/loader/FrameFetchContext.cpp
index 7eee0125a243760fdbcb05e3f3ea4b57e8fc6096..32d1987b3ac4e69a137e3c69adb092c3e2ce2398 100644
--- a/third_party/WebKit/Source/core/loader/FrameFetchContext.cpp
+++ b/third_party/WebKit/Source/core/loader/FrameFetchContext.cpp
@@ -817,10 +817,27 @@ ResourceRequestBlockedReason FrameFetchContext::canRequestInternal(
   // proceed.
   DocumentLoader* documentLoader = masterDocumentLoader();
   if (documentLoader && documentLoader->subresourceFilter() &&
-      type != Resource::MainResource && type != Resource::ImportResource &&
-      !documentLoader->subresourceFilter()->allowLoad(
-          url, resourceRequest.requestContext()))
-    return ResourceRequestBlockedReason::SubresourceFilter;
+      type != Resource::MainResource && type != Resource::ImportResource) {
+    WebDocumentSubresourceFilter::LoadPolicy loadPolicy =
+        documentLoader->subresourceFilter()->getLoadPolicy(
+            url, resourceRequest.requestContext());
+    // Only report filtering information for non preloads.
+    if (!forPreload) {
+      switch (loadPolicy) {
+        case WebDocumentSubresourceFilter::Allow:
+          break;
+        case WebDocumentSubresourceFilter::Filter:
+          documentLoader->subresourceFilter()->reportFilteredLoad();
+        // fall through
+        case WebDocumentSubresourceFilter::AllowWouldFilter:
+          documentLoader->didObserveLoadingBehavior(
+              WebLoadingBehaviorSubresourceFilterMatch);
+          break;
+      }
+    }
+    if (loadPolicy == WebDocumentSubresourceFilter::Filter)
+      return ResourceRequestBlockedReason::SubresourceFilter;
+  }
 
   return ResourceRequestBlockedReason::None;
 }