Re-land: cc: Use worker context for one-copy tile initialization.

gpu/command_buffer/client/cmd_buffer_helper.cc

Index: gpu/command_buffer/client/cmd_buffer_helper.cc
diff --git a/gpu/command_buffer/client/cmd_buffer_helper.cc b/gpu/command_buffer/client/cmd_buffer_helper.cc
index b6306d7fd935d7950404ba0f63ad636de413b2dd..2750903b716ab1bb648dcad7e7787ebecd583cfd 100644
--- a/gpu/command_buffer/client/cmd_buffer_helper.cc
+++ b/gpu/command_buffer/client/cmd_buffer_helper.cc
@@ -198,7 +198,8 @@ bool CommandBufferHelper::Finish() {
   if (put_ == get_offset()) {
     return true;
   }
-  DCHECK(HaveRingBuffer());
+  DCHECK(HaveRingBuffer() ||
+         error::IsError(command_buffer_->GetLastState().error));

[Ken Russell (switch to Gerrit), 2015/08/17 19:59:07]

If the error::IsError case is hit in this DCHECK, will the code below work
correctly? In particular, the call to WaitForGetOffsetInRange? Will callers
notice the failures?

[piman, 2015/08/17 22:29:55]

WaitForGetOffsetInRange will return false immediately.

   Flush();
   if (!WaitForGetOffsetInRange(put_, put_))
     return false;