[Mac] Add field trial tuples to breakpad crash reports.

chrome/common/child_process_logging.h

Index: chrome/common/child_process_logging.h
===================================================================
--- chrome/common/child_process_logging.h	(revision 144169)
+++ chrome/common/child_process_logging.h	(working copy)
@@ -31,6 +31,9 @@
 // dependency.
 static const int kMaxReportedExperimentChunks = 15;
 
+// The maximum size of an experiment chunk.
+static const int kMaxExperimentChunkSize = 64;

[Scott Hess - ex-Googler, 2012/06/27 00:32:41]

Is the plan to share the chunking with other platforms?  Because I think that
OSX Breakpad's limit per value is 256 (or perhaps 255).

If you aren't going to share with other platforms, I think it would be better to
treat the chunking as an implementation detail for the OSX code doing the
storage, since it's not really specific to the location where it's at.

[MAD, 2012/06/28 13:03:38]

Please add a comment explaining why we kept 64.

[Alexei Svitkine (slow), 2012/06/28 15:01:32]

Done.

+
 // The maximum number of prn-info-* records.
 static const size_t kMaxReportedPrinterRecords = 4;