Add glClientWaitSync to GPU command buffer.

gpu/command_buffer/client/gles2_c_lib_autogen.h

Index: gpu/command_buffer/client/gles2_c_lib_autogen.h
diff --git a/gpu/command_buffer/client/gles2_c_lib_autogen.h b/gpu/command_buffer/client/gles2_c_lib_autogen.h
index 23d3d6ea8554a725f155e873d4f43a890a48dbd8..40b8f109b0fe102ead6a5fb399f08d0b9b5ff900 100644
--- a/gpu/command_buffer/client/gles2_c_lib_autogen.h
+++ b/gpu/command_buffer/client/gles2_c_lib_autogen.h
@@ -119,6 +119,9 @@ void GLES2ClearDepthf(GLclampf depth) {
 void GLES2ClearStencil(GLint s) {
   gles2::GetGLContext()->ClearStencil(s);
 }
+GLenum GLES2ClientWaitSync(GLsync sync, GLbitfield flags, GLuint64 timeout) {
+  return gles2::GetGLContext()->ClientWaitSync(sync, flags, timeout);
+}
 void GLES2ColorMask(GLboolean red,
                     GLboolean green,
                     GLboolean blue,
@@ -1421,6 +1424,10 @@ extern const NameToFunc g_gles2_function_table[] = {
      reinterpret_cast<GLES2FunctionPointer>(glClearStencil),
     },
     {
+     "glClientWaitSync",
+     reinterpret_cast<GLES2FunctionPointer>(glClientWaitSync),
+    },
+    {
      "glColorMask",
      reinterpret_cast<GLES2FunctionPointer>(glColorMask),
     },