Histograms - Support histograms for Plugins, GPU

content/public/common/content_constants.h

Index: content/public/common/content_constants.h
===================================================================
--- content/public/common/content_constants.h	(revision 146279)
+++ content/public/common/content_constants.h	(working copy)
@@ -46,6 +46,13 @@
 extern const int kStatsMaxThreads;
 extern const int kStatsMaxCounters;
 
+// Most sequence numbers are used by a renderer when responding to a browser
+// request for histogram data.  This reserved number is used when a renderer
+// sends an unprovoked update, such as after a page has been loaded.  Using
+// this reserved constant avoids any chance of confusion with a response having
+// a browser-supplied sequence number.
+CONTENT_EXPORT extern const int kHistogramSynchronizerReservedSequenceNumber;
+
 }  // namespace content
 
 #endif  // CONTENT_PUBLIC_COMMON_CONTENT_CONSTANTS_H_