Handle pointer-events: none in browser process hittesting.

cc/surfaces/surface_id.h

Index: cc/surfaces/surface_id.h
diff --git a/cc/surfaces/surface_id.h b/cc/surfaces/surface_id.h
index 0ade6ab9135928c95d3a1e7cb9d70e4ef81e2078..f43759c2d6ce8b9f3dc3f5ef2520748b58c6aba1 100644
--- a/cc/surfaces/surface_id.h
+++ b/cc/surfaces/surface_id.h
@@ -8,6 +8,8 @@
 #include <stddef.h>
 #include <stdint.h>
 
+#include <functional>
+
 #include "base/containers/hash_tables.h"
 
 namespace cc {
@@ -33,6 +35,12 @@ inline bool operator<(const SurfaceId& a, const SurfaceId& b) {
   return a.id < b.id;
 }
 
+struct SurfaceIdHash {
+  size_t operator()(const SurfaceId& key) const {
+    return std::hash<uint64_t>()(key.id);
+  }
+};
+
 }  // namespace cc
 
 namespace BASE_HASH_NAMESPACE {