Add --in-process-gpu for Linux CI to fix OnContextInitialized timeout

The GPU subprocess is spawned during CefInitialize() and fails with
"Failed global descriptor lookup: 7" because CEF 146 does not pass
the field-trial shared-memory fd to subprocesses in --no-sandbox mode.
This crash blocks OnContextInitialized from firing within the 6-second
poll, so CreateBrowserSync() returns None.

--in-process-gpu runs the GPU inside the browser process, eliminating
the failing subprocess launch and unblocking initialization.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: linesight

unittests/main_test.py

@@ -144,18 +144,19 @@ def test_main(self):
         # Chrome 130+ blocks window.open() called without a user gesture.
         switches = {"disable-popup-blocking": ""}
         if LINUX:
-            # Sandbox setup (user-namespace) fails on CI runners; GPU process
-            # also needs --no-sandbox to launch successfully under xvfb.
+            # Sandbox setup (user-namespace) fails on CI runners.
             switches["no-sandbox"] = ""
             # /dev/shm is too small in CI containers; renderer subprocess
             # fails shared-memory descriptor lookup (global descriptor 7).
             switches["disable-dev-shm-usage"] = ""
-            # GPU acceleration is not available under xvfb; disabling it
-            # reduces startup time and avoids GPU process launch failures.
+            # GPU acceleration is not available under xvfb.
             switches["disable-gpu"] = ""
             switches["disable-gpu-compositing"] = ""
-            # Zygote FD-passing fails in CI containers; launch renderers
-            # directly from the browser process instead.
+            # Run GPU process inside the browser process. Without this,
+            # the GPU subprocess is spawned during CefInitialize() and
+            # fails the global descriptor lookup (key 7), which prevents
+            # OnContextInitialized from firing and browser creation fails.
+            switches["in-process-gpu"] = ""
             switches["no-zygote"] = ""
         cef.Initialize(settings, switches=switches)
         subtest_message("cef.Initialize() ok")

unittests/osr_test.py

@@ -113,14 +113,16 @@ def test_osr(self):
             "disable-surfaces": "",  # This is required for PDF ext to work
         }
         if LINUX:
-            # Sandbox setup fails on CI runners; subprocess won't launch
-            # without this under xvfb even with --disable-gpu.
+            # Sandbox setup fails on CI runners.
             switches["no-sandbox"] = ""
             # /dev/shm is too small in CI containers; renderer subprocess
             # fails shared-memory descriptor lookup (global descriptor 7).
             switches["disable-dev-shm-usage"] = ""
-            # Zygote FD-passing fails in CI containers; launch renderers
-            # directly from the browser process instead.
+            # Run GPU process inside the browser process so the GPU
+            # subprocess is not spawned during CefInitialize() and does
+            # not fail the global descriptor lookup that blocks
+            # OnContextInitialized from firing.
+            switches["in-process-gpu"] = ""
             switches["no-zygote"] = ""
         browser_settings = {
             # Tweaking OSR performance (Issue #240)