Add instrumentation hooks to mesaure which subresource filter rules are used.

components/subresource_filter/core/common/url_pattern_index_unittest.cc

 // Copyright 2017 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "components/subresource_filter/core/common/url_pattern_index.h"
 
 #include <algorithm>
 #include <memory>
 #include <string>
 #include <vector>
@@ skipping 34 matching lines @@
   const flat::UrlRule* FindMatch(
       base::StringPiece url_string,
       base::StringPiece document_origin_string = base::StringPiece(),
       proto::ElementType element_type = kOther,
       proto::ActivationType activation_type = kNoActivation,
       bool disable_generic_rules = false) {
     const GURL url(url_string);
     const url::Origin document_origin = GetOrigin(document_origin_string);
     return index_matcher_->FindMatch(
         url, document_origin, element_type, activation_type,
-        IsThirdParty(url, document_origin), disable_generic_rules);
+        IsThirdParty(url, document_origin), disable_generic_rules, nullptr);
   }
 
   bool IsOutOfRange(const flat::UrlRule* rule) const {
     if (!rule)
       return false;
     const auto* data = reinterpret_cast<const uint8_t*>(rule);
     return data < flat_builder_->GetBufferPointer() ||
            data >= flat_builder_->GetBufferPointer() + flat_builder_->GetSize();
   }
 
@@ skipping 632 matching lines @@
     ASSERT_TRUE(rule_pattern);
     EXPECT_EQ(url_pattern,
               base::StringPiece(rule_pattern->data(), rule_pattern->size()));
   }
 
   EXPECT_FALSE(
       FindMatch("http://example." + std::to_string(kNumOfPatterns) + ".com"));
 }
 
 }  // namespace subresource_filter