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

gpu/command_buffer/client/gles2_implementation.cc

Index: gpu/command_buffer/client/gles2_implementation.cc
===================================================================
--- gpu/command_buffer/client/gles2_implementation.cc	(revision 34314)
+++ gpu/command_buffer/client/gles2_implementation.cc	(working copy)
@@ -9,7 +9,7 @@
 #include "gpu/command_buffer/client/gles2_implementation_gen.h"
 #include "gpu/command_buffer/common/gles2_cmd_utils.h"
 
-namespace command_buffer {
+namespace gpu {
 namespace gles2 {
 
 // A 32-bit and 64-bit compatible way of converting a pointer to a GLuint.
@@ -253,4 +253,4 @@
 
 
 }  // namespace gles2
-}  // namespace command_buffer
+}  // namespace gpu