Added CommandBufferClient, CommandBufferStub and some IPC messages....

gpu/command_buffer/common/gles2_cmd_format.cc

Index: gpu/command_buffer/common/gles2_cmd_format.cc
===================================================================
--- gpu/command_buffer/common/gles2_cmd_format.cc	(revision 34314)
+++ gpu/command_buffer/common/gles2_cmd_format.cc	(working copy)
@@ -9,7 +9,7 @@
 // and service side have different requirements.
 #include "gpu/command_buffer/common/cmd_buffer_common.h"
 
-namespace command_buffer {
+namespace gpu {
 namespace gles2 {
 
 #include "gpu/command_buffer/common/gles2_cmd_ids_autogen.h"
@@ -29,6 +29,6 @@
 }
 
 }  // namespace gles2
-}  // namespace command_buffer
+}  // namespace gpu