The following error message appears:

[5247/13765] CXX obj/gpu/command_buffer/service/command_buffer_service.async_pixel_transfer_manager_linux.o
FAILED: c++ -MMD -MF obj/gpu/command_buffer/service/command_buffer_service.async_pixel_transfer_manager_linux.o.d -DV8_DEPRECATION_WARNINGS -DBLINK_SCALE_FILTERS_AT_RECORD_TIME -D_FILE_OFFSET_BITS=64 -DNO_TCMALLOC -DDISABLE_NACL -DCHROMIUM_BUILD -DCR_CLANG_REVISION=206824 -DTOOLKIT_VIEWS=1 -DUSE_AURA=1 -DUSE_CAIRO=1 -DUSE_GLIB=1 -DUSE_DEFAULT_RENDER_THEME=1 -DUSE_LIBJPEG_TURBO=1 -DUSE_X11=1 -DUSE_CLIPBOARD_AURAX11=1 -DENABLE_ONE_CLICK_SIGNIN -DUSE_XI2_MT=2 -DENABLE_REMOTING=1 -DENABLE_WEBRTC=1 -DUSE_PROPRIETARY_CODECS -DENABLE_CONFIGURATION_POLICY -DENABLE_NOTIFICATIONS -DENABLE_EGLIMAGE=1 -DENABLE_TASK_MANAGER=1 -DENABLE_EXTENSIONS=1 -DENABLE_PLUGINS=1 -DENABLE_SESSION_SERVICE=1 -DENABLE_THEMES=1 -DENABLE_AUTOFILL_DIALOG=1 -DENABLE_BACKGROUND=1 -DENABLE_GOOGLE_NOW=1 -DCLD_VERSION=2 -DENABLE_FULL_PRINTING=1 -DENABLE_PRINTING=1 -DENABLE_SPELLCHECK=1 -DENABLE_CAPTIVE_PORTAL_DETECTION=1 -DENABLE_APP_LIST=1 -DENABLE_SETTINGS_APP=1 -DENABLE_MANAGED_USERS=1 '-DDATA_REDUCTION_FALLBACK_HOST="http://compress.googlezip.net:80/"' '-DDATA_REDUCTION_DEV_HOST="http://proxy-dev.googlezip.net:80/"' '-DSPDY_PROXY_AUTH_ORIGIN="https://proxy.googlezip.net:443/"' '-DDATA_REDUCTION_PROXY_PROBE_URL="http://check.googlezip.net/connect"' -DGL_GLEXT_PROTOTYPES -DUSE_SYSTEM_PROTOBUF -DGOOGLE_PROTOBUF_NO_RTTI -DGOOGLE_PROTOBUF_NO_STATIC_INITIALIZER -DSK_ENABLE_INST_COUNT=0 -DSK_SUPPORT_GPU=1 '-DGR_GL_CUSTOM_SETUP_HEADER="GrGLConfig_chrome.h"' -DSK_ENABLE_LEGACY_API_ALIASING=1 -DSK_ATTR_DEPRECATED=SK_NOTHING_ARG1 -DGR_GL_IGNORE_ES3_MSAA=0 -DSK_WILL_NEVER_DRAW_PERSPECTIVE_TEXT -DSK_SUPPORT_LEGACY_PUBLICEFFECTCONSTRUCTORS=1 -DSK_SUPPORT_LEGACY_GETTOPDEVICE -DSK_SUPPORT_LEGACY_N32_NAME -DSK_SUPPORT_LEGACY_BLURMASKFILTER_STYLE -DSK_SUPPORT_LEGACY_GETTOTALCLIP -DSK_USE_POSIX_THREADS -DSK_DEFERRED_CANVAS_USES_FACTORIES=1 -DU_USING_ICU_NAMESPACE=0 -DUSE_NSS=1 -D__STDC_CONSTANT_MACROS -D__STDC_FORMAT_MACROS -DNDEBUG -DNVALGRIND -DDYNAMIC_ANNOTATIONS_ENABLED=0 -D_FORTIFY_SOURCE=2 -Igen/shim_headers/libpng/target -Igen/shim_headers/zlib/target -Igen/shim_headers/icuuc/target -Igen/shim_headers/icui18n/target -Igen/shim_headers/re2/target -Igen/shim_headers/libevent/target -I../.. -I../../third_party/khronos -I../../gpu -I/usr/local/include -I../../skia/config -Igen/protoc_out -I../../net/third_party/nss/ssl -I../../third_party/skia/src/core -I../../third_party/skia/include/core -I../../third_party/skia/include/effects -I../../third_party/skia/include/pdf -I../../third_party/skia/include/gpu -I../../third_party/skia/include/lazy -I../../third_party/skia/include/pathops -I../../third_party/skia/include/pipe -I../../third_party/skia/include/ports -I../../third_party/skia/include/utils -I../../skia/ext -Igen/ui/gl -I../../third_party/mesa/src/include -fstack-protector --param=ssp-buffer-size=4  -pthread -fno-exceptions -fno-strict-aliasing -Wall -Wno-unused-parameter -Wno-missing-field-initializers -fvisibility=hidden -pipe -fPIC -Wheader-hygiene -Wno-char-subscripts -Wno-unneeded-internal-declaration -Wno-covered-switch-default -Wstring-conversion -Wno-c++11-narrowing -Wno-reserved-user-defined-literal -Wno-deprecated-register -Wno-absolute-value -fcolor-diagnostics -pthread -I/usr/local/include/glib-2.0 -I/usr/local/include -I/usr/local/include/nss -I/usr/local/include/nss/nss -I/usr/local/include/nspr -Wno-header-guard -I/usr/local/include -D_THREAD_SAFE -pthread -I/usr/local/include -I/usr/local/include -m64 -march=x86-64 -O2 -fdata-sections -ffunction-sections -funwind-tables -O2 -pipe -fno-stack-protector -Wno-unknown-warning-option -fno-strict-aliasing -fno-rtti -fno-threadsafe-statics -fvisibility-inlines-hidden -Wsign-compare -std=gnu++11  -c ../../gpu/command_buffer/service/async_pixel_transfer_manager_linux.cc -o obj/gpu/command_buffer/service/command_buffer_service.async_pixel_transfer_manager_linux.o
In file included from ../../gpu/command_buffer/service/async_pixel_transfer_manager_linux.cc:5:
In file included from ../../gpu/command_buffer/service/async_pixel_transfer_manager.h:15:
In file included from ../../gpu/command_buffer/service/texture_manager.h:16:
In file included from ../../gpu/command_buffer/service/async_pixel_transfer_delegate.h:16:
In file included from ../../ui/gl/gl_bindings.h:230:
gen/ui/gl/gl_bindings_autogen_gl.h:70:81: error: unknown type name 'GLeglImageOES'
typedef void (GL_BINDING_CALL *glEGLImageTargetTexture2DOESProc)(GLenum target, GLeglImageOES image);
                                                                                ^
gen/ui/gl/gl_bindings_autogen_gl.h:71:91: error: unknown type name 'GLeglImageOES'
typedef void (GL_BINDING_CALL *glEGLImageTargetRenderbufferStorageOESProc)(GLenum target, GLeglImageOES image);
                                                                                          ^
gen/ui/gl/gl_bindings_autogen_gl.h:543:62: error: unknown type name 'GLeglImageOES'
  virtual void glEGLImageTargetTexture2DOESFn(GLenum target, GLeglImageOES image) = 0;
                                                             ^
gen/ui/gl/gl_bindings_autogen_gl.h:544:72: error: unknown type name 'GLeglImageOES'
  virtual void glEGLImageTargetRenderbufferStorageOESFn(GLenum target, GLeglImageOES image) = 0;
                                                                       ^
4 errors generated.
ninja: build stopped: subcommand failed.
===> Compilation failed unexpectedly.
Try to set MAKE_JOBS_UNSAFE=yes and rebuild before reporting the failure to
the maintainer.
*** Error code 1

Stop.
make[1]: stopped in /usr/ports/www/chromium
*** Error code 1

Stop.
make: stopped in /usr/ports/www/chromium