Support impl-side painting in Mandoline.

mojo/gles2/command_buffer_client_impl.h

Index: mojo/gles2/command_buffer_client_impl.h
diff --git a/mojo/gles2/command_buffer_client_impl.h b/mojo/gles2/command_buffer_client_impl.h
index 16eb7b84bbea907af8a6849ed69231e86a83eb65..74e6db74a7f34cf7c434f6a2778ead23b9c57ad0 100644
--- a/mojo/gles2/command_buffer_client_impl.h
+++ b/mojo/gles2/command_buffer_client_impl.h
@@ -6,7 +6,8 @@
 #define MOJO_GLES2_COMMAND_BUFFER_CLIENT_IMPL_H_
 
 #include <map>
-
+
+#include "base/atomic_sequence_num.h"
 #include "base/macros.h"
 #include "base/memory/scoped_ptr.h"
 #include "components/view_manager/public/interfaces/command_buffer.mojom.h"
@@ -102,6 +103,9 @@ class CommandBufferClientImpl : public mojo::CommandBufferLostContextObserver,
   int32_t last_put_offset_;
   int32_t next_transfer_buffer_id_;
 
+  // Image IDs are allocated in sequence.
+  base::AtomicSequenceNumber next_image_id_;

[piman, 2015/06/15 18:14:33]

nit: shouldn't need to be atomic, this class should be used from a single thread
at a time.

[jam, 2015/06/15 22:06:02]

Done.

+
   const MojoAsyncWaiter* async_waiter_;
 };