Add glClientWaitSync to GPU command buffer.

gpu/command_buffer/client/gles2_cmd_helper_autogen.h

Index: gpu/command_buffer/client/gles2_cmd_helper_autogen.h
diff --git a/gpu/command_buffer/client/gles2_cmd_helper_autogen.h b/gpu/command_buffer/client/gles2_cmd_helper_autogen.h
index bda8bb3b965d39d58d5abae54bd5af8c2fa93b3e..650c8698a5bb3b6541c909ace41b0bb0fca4ce73 100644
--- a/gpu/command_buffer/client/gles2_cmd_helper_autogen.h
+++ b/gpu/command_buffer/client/gles2_cmd_helper_autogen.h
@@ -240,6 +240,19 @@ void ClearStencil(GLint s) {
   }
 }
 
+void ClientWaitSync(GLuint sync,
+                    GLbitfield flags,
+                    GLuint timeout_0,
+                    GLuint timeout_1,
+                    uint32_t result_shm_id,
+                    uint32_t result_shm_offset) {
+  gles2::cmds::ClientWaitSync* c = GetCmdSpace<gles2::cmds::ClientWaitSync>();
+  if (c) {
+    c->Init(sync, flags, timeout_0, timeout_1, result_shm_id,
+            result_shm_offset);
+  }
+}
+
 void ColorMask(GLboolean red,
                GLboolean green,
                GLboolean blue,