Capture a report on failed browser rendez-vous.

build/common.gypi

Index: build/common.gypi
diff --git a/build/common.gypi b/build/common.gypi
index 871daa551a522b65f0a45dbe79300474682e86ef..a57eb30c84484e0e9dd957506ed2f5b8eb764a20 100644
--- a/build/common.gypi
+++ b/build/common.gypi
@@ -1078,6 +1078,10 @@
       # Enable hang reports in Kasko. Requires Kasko to be enabled.
       'kasko_hang_reports%': 0,
 
+      # Enable failed rendez-vous reports in Kasko. Requires Kasko to be
+      # enabled.
+      'kasko_failed_rdv_reports%': 0,
+
       # Setting this to '0' will cause V8's startup snapshot to be
       # embedded in the binary instead of being a external files.
       'v8_use_external_startup_data%': 1,
@@ -1228,6 +1232,7 @@
     'syzyasan%': '<(syzyasan)',
     'kasko%': '<(kasko)',
     'kasko_hang_reports%': '<(kasko_hang_reports)',
+    'kasko_failed_rdv_reports%': '<(kasko_failed_rdv_reports)',
     'syzygy_optimize%': '<(syzygy_optimize)',
     'lsan%': '<(lsan)',
     'msan%': '<(msan)',
@@ -2028,6 +2033,8 @@
             'kasko%': 1,
             # Disable hang reports for SyzyASAN builds.
             'kasko_hang_reports': 0,
+            # Disable failed rendez-vous reports for SyzyASAN builds.
+            'kasko_failed_rdv_reports': 0,
           }],
           ['component=="shared_library" and "<(GENERATOR)"=="ninja"', {
             # Only enabled by default for ninja because it's buggy in VS.