Add experiments info to crash dumps.

chrome/common/child_process_logging_mac.mm

Index: chrome/common/child_process_logging_mac.mm
===================================================================
--- chrome/common/child_process_logging_mac.mm	(revision 125856)
+++ chrome/common/child_process_logging_mac.mm	(working copy)
@@ -205,6 +205,15 @@
   }
 }
 
+void InitExperimentList() {
+  // TODO(mad): Implement this.
+}
+
+void AddFieldTrialGroup(const std::string& field_trial_name,
+                        const std::string& group_name) {
+  // TODO(mad): Implement this.
+}
+
 void SetChannel(const std::string& channel) {
   // This should match the corresponding string in breakpad_win.cc.
   NSString* const kChannelKey = @"channel";