Added facility to stub log and check. It is still not ideal but workable.

gpu/command_buffer/client/cmd_buffer_helper.cc

Index: gpu/command_buffer/client/cmd_buffer_helper.cc
===================================================================
--- gpu/command_buffer/client/cmd_buffer_helper.cc	(revision 45037)
+++ gpu/command_buffer/client/cmd_buffer_helper.cc	(working copy)
@@ -83,7 +83,7 @@
   Flush();
   while (last_token_read_ < token) {
     if (get_ == put_) {
-      GPU_LOG(FATAL) << "Empty command buffer while waiting on a token.";
+      LOG(FATAL) << "Empty command buffer while waiting on a token.";
       return;
     }
     // Do not loop forever if the flush fails, meaning the command buffer reader
@@ -99,7 +99,7 @@
 // The function will return early if an error occurs, in which case the
 // available space may not be available.
 void CommandBufferHelper::WaitForAvailableEntries(int32 count) {
-  GPU_CHECK(count < entry_count_);
+  CHECK(count < entry_count_);
   if (put_ + count > entry_count_) {
     // There's not enough room between the current put and the end of the
     // buffer, so we need to wrap. We will add noops all the way to the end,