cc: Set sync token on resource even if context is lost.

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 49dae1d6ae988284713422c430f0f1e8a2f814e8..86b5eb334a592afd4e41b24c1ea75679379fe3b2 100644
--- a/cc/resources/resource_provider.cc
+++ b/cc/resources/resource_provider.cc
@@ -1101,6 +1101,7 @@ ResourceProvider::ScopedWriteLockGL::ScopedWriteLockGL(
     bool create_mailbox)
     : resource_provider_(resource_provider),
       resource_id_(resource_id),
+      set_sync_token_(false),

[danakj, 2016/10/06 20:50:35]

nit: has_sync_token_

[sunnyps, 2016/10/06 21:31:53]

Done.

       synchronized_(false) {
   DCHECK(thread_checker_.CalledOnValidThread());
   Resource* resource = resource_provider->LockForWrite(resource_id);
@@ -1123,7 +1124,7 @@ ResourceProvider::ScopedWriteLockGL::~ScopedWriteLockGL() {
   DCHECK(thread_checker_.CalledOnValidThread());
   Resource* resource = resource_provider_->GetResource(resource_id_);
   DCHECK(resource->locked_for_write);
-  if (sync_token_.HasData())
+  if (set_sync_token_)

[danakj, 2016/10/06 20:50:35]

Can you leave a comment saying why you're not checking HasData() tho for future
code wayfarers? 

[sunnyps, 2016/10/06 21:31:52]

Done.

     resource->UpdateSyncToken(sync_token_);
   if (synchronized_)
     resource->SetSynchronized();