Aggregate DocumentSubresourceFilter counters on page level.

components/subresource_filter/content/common/subresource_filter_messages.h

Index: components/subresource_filter/content/common/subresource_filter_messages.h
diff --git a/components/subresource_filter/content/common/subresource_filter_messages.h b/components/subresource_filter/content/common/subresource_filter_messages.h
index 33aaaee1f2a16c5f98ecc042ed38a1a14dd8b3f9..c1c92acf6c03cbf49a499016eba8d5e9bf6ad9c5 100644
--- a/components/subresource_filter/content/common/subresource_filter_messages.h
+++ b/components/subresource_filter/content/common/subresource_filter_messages.h
@@ -5,6 +5,7 @@
 // Message definition file, included multiple times, hence no include guard.
 
 #include "base/time/time.h"
+#include "components/subresource_filter/content/common/document_load_statistics.h"
 #include "components/subresource_filter/core/common/activation_state.h"
 #include "content/public/common/common_param_traits_macros.h"
 #include "ipc/ipc_message_macros.h"
@@ -17,6 +18,15 @@
 IPC_ENUM_TRAITS_MAX_VALUE(subresource_filter::ActivationState,
                           subresource_filter::ActivationState::LAST);
 
+IPC_STRUCT_TRAITS_BEGIN(subresource_filter::DocumentLoadStatistics)
+  IPC_STRUCT_TRAITS_MEMBER(num_loads_total)
+  IPC_STRUCT_TRAITS_MEMBER(num_loads_evaluated)
+  IPC_STRUCT_TRAITS_MEMBER(num_loads_matching_rules)
+  IPC_STRUCT_TRAITS_MEMBER(num_loads_disallowed)
+  IPC_STRUCT_TRAITS_MEMBER(evaluation_total_wall_duration)
+  IPC_STRUCT_TRAITS_MEMBER(evaluation_total_cpu_duration)
+IPC_STRUCT_TRAITS_END()
+
 // ----------------------------------------------------------------------------
 // Messages sent from the browser to the renderer.
 // ----------------------------------------------------------------------------
@@ -46,9 +56,11 @@ IPC_MESSAGE_ROUTED3(SubresourceFilterMsg_ActivateForProvisionalLoad,
 IPC_MESSAGE_ROUTED0(SubresourceFilterHostMsg_DidDisallowFirstSubresource);
 
 // This is sent to a RenderFrameHost in the browser when a document load is
-// finished, just before the DidFinishLoad message, if performance measurements
-// were enabled for the load. Contains the total time spent on evaluating
-// subresource loads in DocumentSubresourceFilter::allowLoad() for a frame.
-IPC_MESSAGE_ROUTED2(SubresourceFilterHostMsg_DocumentLoadStatistics,
-                    base::TimeDelta /* evaluation_total_wall_duration */,
-                    base::TimeDelta /* evaluation_total_cpu_duration */);
+// finished, just before the DidFinishLoad message, and contains statistics
+// collected by the DocumentSubresourceFilter up until that point: the number of
+// subresources evaluated/disallowed/etc, and total time spent on evaluating
+// subresource loads in its allowLoad method. The time metrics are equal to zero
+// if performance measurements were disabled for the load.
+IPC_MESSAGE_ROUTED1(
+    SubresourceFilterHostMsg_DocumentLoadStatistics,
+    subresource_filter::DocumentLoadStatistics /* statistics */);