libsysprof-gtk: start on GTK widgetry library

This is ultimately to replace libsysprof-ui, and will focus on the display
of capture files. Recording will be left to the sysprof application in
terms of UI, and other applications like IDEs will use the
libsysprof-profile API directly along with libsysprof-gtk for visualizing.

src/libsysprof-gtk/tests/meson.build

@@ -0,0 +1,31 @@
+libsysprof_gtk_test_env = [
+  'G_DEBUG=gc-friendly',
+  'GSETTINGS_BACKEND=memory',
+  'MALLOC_CHECK_=2',
+]
+
+libsysprof_gtk_testsuite_c_args = [
+  '-DG_LOG_DOMAIN="libdex"',
+  '-DG_ENABLE_DEBUG',
+  '-UG_DISABLE_ASSERT',
+  '-UG_DISABLE_CAST_CHECKS',
+]
+
+libsysprof_gtk_testsuite = {
+  'test-callgraph' : {'skip': true},
+}
+
+libsysprof_gtk_testsuite_deps = [
+  libsysprof_analyze_static_dep,
+  libsysprof_gtk_static_dep,
+]
+
+foreach test, params: libsysprof_gtk_testsuite
+  test_exe = executable(test, '@0@.c'.format(test),
+          c_args: libsysprof_gtk_testsuite_c_args,
+    dependencies: libsysprof_gtk_testsuite_deps,
+  )
+  if not params.get('skip', false)
+    test(test, test_exe, env: libsysprof_gtk_test_env)
+  endif
+endforeach