Capture a report on failed browser rendez-vous.

Overview:
Browser process hangs are believed to be responsible for a large fraction of browser unclean shutdowns. This patch is to get visibility into the problem on windows using the Kasko reporter.

Note:
This functionality is hidden behind buildflags, and only triggers for users with stats collection consent on canary/unspecified channels. At this time, it is only considered for one-off releases.

Details:
- Use of the Kasko reporter is required for its ability to capture reports from other processes.
- Pulls out Kasko reporting code to kasko_utils
- Invoke Kasko on failed rendez-vous.
- Hidden behind build flags (kasko and kasko-rdv-capture).

BUG=478209

Review URL: https://codereview.chromium.org/1844023002

Cr-Original-Commit-Position: refs/heads/master@{#386983}
Cr-Mirrored-From: https://chromium.googlesource.com/chromium/src
Cr-Mirrored-Commit: f071e88974318cec29c02bd5b92fe61868da8569

common.gypi

@@ -1065,18 +1065,23 @@
           # http://crbug.com/574476
           'fastbuild%': 2,
         }],
-
-        # Enable crash reporting via Kasko.
+        # Enable hang report capture. Capture can only be enabled for 32bit
+        # Windows.
         ['OS=="win" and target_arch=="ia32" and branding=="Chrome"', {
-          # This needs to be enabled with kasko_hang_reports.
-          'kasko%': 0,
+          # Enable hang reports from the watcher process.
+          'kasko_hang_reports%': 0,
+          # Enable failed rendez-vous reports.
+          'kasko_failed_rdv_reports%': 0,
         }, {
-          'kasko%': 0,
+          # Enable hang reports from the watcher process.
+          'kasko_hang_reports%': 0,
+          # Enable failed rendez-vous reports.
+          'kasko_failed_rdv_reports%': 0,
         }],
       ],
 
-      # Enable hang reports in Kasko. Requires Kasko to be enabled.
-      'kasko_hang_reports%': 0,
+      # Kasko reporting is disabled by default, but may get enabled below.
+      'kasko%': 0,
 
       # Setting this to '0' will cause V8's startup snapshot to be
       # embedded in the binary instead of being a external files.
@@ -1228,6 +1233,7 @@
     '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)',
@@ -2023,10 +2029,15 @@
           }, {
             'win_console_app%': 0,
           }],
+          # Disable hang reporting for syzyasan builds.
           ['syzyasan==1', {
-            'kasko%': 1,
-            # Disable hang reports for SyzyASAN builds.
+            # Note: override.
             'kasko_hang_reports': 0,
+            'kasko_failed_rdv_reports': 0,
+          }],
+          # Enable the Kasko reporter for syzyasan builds and hang reporting.
+          ['syzyasan==1 or kasko_hang_reports==1 or kasko_failed_rdv_reports==1', {
+            'kasko': 1,
           }],
           ['component=="shared_library" and "<(GENERATOR)"=="ninja"', {
             # Only enabled by default for ninja because it's buggy in VS.