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..39dcc26766ce3c898003d419ec931f84f2d6488f 100644
--- a/cc/surfaces/surface_id.h
+++ b/cc/surfaces/surface_id.h
@@ -33,6 +33,12 @@ 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);

[dcheng, 2016/01/27 00:25:46]

#include <functional>?

[lfg, 2016/01/27 00:41:01]

Ugh, you're right. (For some reason I thought that wasn't necessary and removed
in the last patch, duh).

+  }
+};
+
 }  // namespace cc
 
 namespace BASE_HASH_NAMESPACE {