cc: Defer texture allocation (to allow async allocations).

cc/resource_update_controller.cc

Index: cc/resource_update_controller.cc
diff --git a/cc/resource_update_controller.cc b/cc/resource_update_controller.cc
index 9c35f8be6e91554ddbbd15c582ba34d1f30de095..1177d5372fcaa69b0d8012bf20243bdc572c23e9 100644
--- a/cc/resource_update_controller.cc
+++ b/cc/resource_update_controller.cc
@@ -141,9 +141,9 @@ void ResourceUpdateController::updateTexture(ResourceUpdate update)
         // is available in other shared contexts. It is important to do here
         // because the backing texture is created in one context while it is
         // being written to in another.
-        m_resourceProvider->flush();
         ResourceProvider::ScopedWriteLockGL lock(
             m_resourceProvider, texture->resourceId());
+        m_resourceProvider->flush();
 
         // Make sure ganesh uses the correct GL context.
         paintContext->makeContextCurrent();