Added a unique command buffer ID for command buffers.

mojo/gles2/command_buffer_client_impl.cc

Index: mojo/gles2/command_buffer_client_impl.cc
diff --git a/mojo/gles2/command_buffer_client_impl.cc b/mojo/gles2/command_buffer_client_impl.cc
index b639f6e40472b2337f4fc5f3ec5040ea992ec3b7..52a5140f7a1f25b7345615b32e94cc72e710910f 100644
--- a/mojo/gles2/command_buffer_client_impl.cc
+++ b/mojo/gles2/command_buffer_client_impl.cc
@@ -120,7 +120,8 @@ CommandBufferClientImpl::CommandBufferClientImpl(
     CommandBufferDelegate* delegate,
     const MojoAsyncWaiter* async_waiter,
     mojo::ScopedMessagePipeHandle command_buffer_handle)
-    : delegate_(delegate),
+    : CommandBuffer(gpu::kCommandBufferNamespace_Invalid, 0),

[rjkroege, 2015/09/15 22:48:41]

Is this right? Your goal with this CL is to give each command buffer a unique id
right? This would give the CommandBuffer instances uniform ids of 0. 

perhaps the ids could work like mojo ViewIds (src/components/mus/ids.h) and be a
combination of client-specific integer and the connect id? this seems more
aligned with mojo.

+      delegate_(delegate),
       observer_binding_(this),
       shared_state_(NULL),
       last_put_offset_(-1),