Monitor crashpad_handler for crashes [sometimes]

chrome/app/chrome_crash_reporter_client_mac.mm

Index: chrome/app/chrome_crash_reporter_client_mac.mm
diff --git a/chrome/app/chrome_crash_reporter_client_mac.mm b/chrome/app/chrome_crash_reporter_client_mac.mm
index d3a227bc5fe81121f940d2b29f3ee89fadf7005a..b990b2f7be12f7958b6443740e1defc8e57ae73a 100644
--- a/chrome/app/chrome_crash_reporter_client_mac.mm
+++ b/chrome/app/chrome_crash_reporter_client_mac.mm
@@ -8,9 +8,12 @@
 
 #include "base/mac/scoped_cftyperef.h"
 #include "base/path_service.h"
+#include "base/rand_util.h"
 #include "base/strings/sys_string_conversions.h"
+#include "chrome/common/channel_info.h"
 #include "chrome/common/chrome_paths.h"
 #include "components/policy/policy_constants.h"
+#include "components/version_info/version_info.h"
 
 #if !defined(DISABLE_NACL)
 #include "base/command_line.h"
@@ -38,3 +41,33 @@
   }
   return false;
 }
+
+bool ChromeCrashReporterClient::ShouldMonitorCrashHandlerExpensively() {
+  // This mechanism dedicates a process to be crashpad_handler's own
+  // crashpad_handler. In Chrome builds for official release, scale back on this
+  // in the more stable channels. Other builds are of more of a developmental
+  // nature, so always enable the additional crash reporting.
+#if defined(GOOGLE_CHROME_BUILD) && defined(OFFICIAL_BUILD)
+  double probability;
+  switch (chrome::GetChannel()) {
+    case version_info::Channel::STABLE:
+      probability = 0.01;
+      break;
+
+    case version_info::Channel::BETA:
+      probability = 0.1;
+      break;
+
+    case version_info::Channel::DEV:
+      probability = 0.25;
+      break;
+
+    case version_info::Channel::CANARY:
+    case version_info::Channel::UNKNOWN:
+      return true;
+  }
+  return base::RandDouble() < probability;
+#else
+  return true;
+#endif
+}