gpu: Set exit_on_context_loss for AMD chromebooks

Before https://crrev.com/c/1363676, a logic bug ensured that
all Chrome OS devices would exit the gpu process on context loss.

It turns out that this workaround was necessary for AMD chromebooks to pass
the dEQP-EGL.functional.robustness.reset_context.shaders.infinite_loop.*
tests.

BUG=b:123606754
TEST=pass dEQP-EGL on grunt

Change-Id: I34f2d601cc0643cdae568955830e56ac3164f851
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1504304
Commit-Queue: Drew Davenport <ddavenport@chromium.org>
Reviewed-by: Stéphane Marchesin <marcheu@chromium.org>
Reviewed-by: Antoine Labour <piman@chromium.org>
Auto-Submit: Drew Davenport <ddavenport@chromium.org>
Cr-Commit-Position: refs/heads/master@{#638698}

gpu/config/gpu_driver_bug_list.json

@@ -3207,6 +3207,18 @@
       "features": [
         "rely_on_implicit_sync_for_swap_buffers"
       ]
+    },
+    {
+      "id": 297,
+      "cr_bugs": [938678],
+      "description": "Needed to pass dEQP-EGL.functional.robustness.reset_context.shaders.infinite_loop.*",
+      "os": {
+        "type" : "chromeos"
+      },
+      "vendor_id": "0x1002",
+      "features": [
+        "exit_on_context_lost"
+      ]
     }
   ]
 }