Monitor crashpad_handler for crashes [sometimes]

components/crash/content/app/crashpad_mac.mm

Index: components/crash/content/app/crashpad_mac.mm
diff --git a/components/crash/content/app/crashpad_mac.mm b/components/crash/content/app/crashpad_mac.mm
index 2cabccb88d19c655afe3248ad10a3086b0afddce..3bae07e14c690869515c4ce233988addad12f1c1 100644
--- a/components/crash/content/app/crashpad_mac.mm
+++ b/components/crash/content/app/crashpad_mac.mm
@@ -66,12 +66,18 @@
           base::SysNSStringToUTF8(product).append("_Mac");
 
 #if defined(GOOGLE_CHROME_BUILD)
+      // Empty means stable.
+      const bool allow_empty_channel = true;
+#else
+      const bool allow_empty_channel = false;
+#endif
       NSString* channel = base::mac::ObjCCast<NSString>(
           [outer_bundle objectForInfoDictionaryKey:@"KSChannelID"]);
       if (channel) {
         process_annotations["channel"] = base::SysNSStringToUTF8(channel);
+      } else if (allow_empty_channel) {
+        process_annotations["channel"] = "";
       }
-#endif
 
       NSString* version =
           base::mac::ObjCCast<NSString>([base::mac::FrameworkBundle()
@@ -81,6 +87,16 @@
       process_annotations["plat"] = std::string("OS X");
 
       std::vector<std::string> arguments;
+
+      if (crash_reporter_client->ShouldMonitorCrashHandlerExpensively()) {
+        arguments.push_back("--monitor-self");
+      }
+
+      // Set up --monitor-self-annotation even in the absence of --monitor-self
+      // so that minidumps produced by Crashpad's generate_dump tool will
+      // contain these annotations.
+      arguments.push_back("--monitor-self-annotation=ptype=crashpad-handler");
+
       if (!browser_process) {
         // If this is an initial client that's not the browser process, it's
         // important that the new Crashpad handler also not be connected to any