cc: Lock resources directly in CALayerOverlay

cc/resources/resource_provider.cc

Index: cc/resources/resource_provider.cc
diff --git a/cc/resources/resource_provider.cc b/cc/resources/resource_provider.cc
index c1ca12c0c33d4b316c30c9b55869f59df4b4e1ed..e174995c61d4fc2908bb5fc39ab559823c4621da 100644
--- a/cc/resources/resource_provider.cc
+++ b/cc/resources/resource_provider.cc
@@ -1128,6 +1128,11 @@ ResourceId ResourceProvider::ScopedReadLockGpuMemoryBuffer::GetResourceId()
   return resource_id_;
 }
 
+bool ResourceProvider::ScopedReadLockGpuMemoryBuffer::IsOverlayCandidate()
+    const {
+  return resource_->is_overlay_candidate;
+}
+
 ResourceProvider::ScopedWriteLockGr::ScopedWriteLockGr(
     ResourceProvider* resource_provider,
     ResourceId resource_id)