Bug 673837 - Telemeterize js-compartment-count. r=nnethercote.

toolkit/components/telemetry/TelemetryHistograms.h

@@ -50,6 +50,8 @@ HISTOGRAM(CYCLE_COLLECTOR_VISITED_GCED, 1, 300000, 50, EXPONENTIAL, "Number of J
 HISTOGRAM(CYCLE_COLLECTOR_COLLECTED, 1, 100000, 50, EXPONENTIAL, "Number of objects collected by the cycle collector")
 HISTOGRAM(TELEMETRY_PING, 1, 3000, 10, EXPONENTIAL, "Time taken to submit telemetry info (ms)")
 HISTOGRAM(TELEMETRY_SUCCESS, 0, 1, 2, BOOLEAN,  "Successful telemetry submission")
+HISTOGRAM(MEMORY_JS_COMPARTMENTS_SYSTEM, 1, 1000, 10, EXPONENTIAL, "Total JavaScript compartments used for add-ons and internals.")
+HISTOGRAM(MEMORY_JS_COMPARTMENTS_USER, 1, 1000, 10, EXPONENTIAL, "Total JavaScript compartments used for web pages")
 HISTOGRAM(MEMORY_JS_GC_HEAP, 1024, 512 * 1024, 10, EXPONENTIAL, "Memory used by the garbage-collected JavaScript heap (KB)")
 HISTOGRAM(MEMORY_RESIDENT, 32 * 1024, 1024 * 1024, 10, EXPONENTIAL, "Resident memory size (KB)")
 HISTOGRAM(MEMORY_LAYOUT_ALL, 1024, 64 * 1024, 10, EXPONENTIAL, "Memory used by layout (KB)")

toolkit/components/telemetry/TelemetryPing.js

@@ -55,6 +55,8 @@ const TELEMETRY_DELAY = 60000;
 // about:memory values to turn into histograms
 const MEM_HISTOGRAMS = {
   "js-gc-heap": "MEMORY_JS_GC_HEAP",
+  "js-compartments-system": "MEMORY_JS_COMPARTMENTS_SYSTEM",
+  "js-compartments-user": "MEMORY_JS_COMPARTMENTS_USER",
   "resident": "MEMORY_RESIDENT",
   "explicit/layout/all": "MEMORY_LAYOUT_ALL",
   "explicit/images/content/used/uncompressed":