Bug 1347552 - Add telemetry for the Layout panel. r=sole, bsmedberg

devtools/client/shared/telemetry.js

@@ -97,6 +97,10 @@ Telemetry.prototype = {
       histogram: "DEVTOOLS_COMPUTEDVIEW_OPENED_COUNT",
       timerHistogram: "DEVTOOLS_COMPUTEDVIEW_TIME_ACTIVE_SECONDS"
     },
+    layoutview: {
+      histogram: "DEVTOOLS_LAYOUTVIEW_OPENED_COUNT",
+      timerHistogram: "DEVTOOLS_LAYOUTVIEW_TIME_ACTIVE_SECONDS"
+    },
     fontinspector: {
       histogram: "DEVTOOLS_FONTINSPECTOR_OPENED_COUNT",
       timerHistogram: "DEVTOOLS_FONTINSPECTOR_TIME_ACTIVE_SECONDS"

devtools/client/shared/test/browser_telemetry_sidebar.js

@@ -29,7 +29,7 @@ function* testSidebar(toolbox) {
   info("Testing sidebar");
 
   let inspector = toolbox.getCurrentPanel();
-  let sidebarTools = ["ruleview", "computedview", "fontinspector",
+  let sidebarTools = ["ruleview", "computedview", "layoutview", "fontinspector",
                       "animationinspector"];
 
   // Concatenate the array with itself so that we can open each tool twice.

toolkit/components/telemetry/Histograms.json

@@ -7745,6 +7745,14 @@
     "description": "Number of times the DevTools Computed View has been opened.",
     "releaseChannelCollection": "opt-out"
   },
+  "DEVTOOLS_LAYOUTVIEW_OPENED_COUNT": {
+    "alert_emails": ["dev-developer-tools@lists.mozilla.org"],
+    "expires_in_version": "never",
+    "kind": "count",
+    "bug_numbers": [1347552],
+    "description": "Number of times the DevTools Layout View has been opened.",
+    "releaseChannelCollection": "opt-out"
+  },
   "DEVTOOLS_FONTINSPECTOR_OPENED_COUNT": {
     "alert_emails": ["dev-developer-tools@lists.mozilla.org"],
     "expires_in_version": "never",
@@ -8040,6 +8048,13 @@
     "n_buckets": 100,
     "description": "How long has the computed view been active (seconds)"
   },
+  "DEVTOOLS_LAYOUTVIEW_TIME_ACTIVE_SECONDS": {
+    "expires_in_version": "never",
+    "kind": "exponential",
+    "high": 10000000,
+    "n_buckets": 100,
+    "description": "How long has the layout view been active (seconds)"
+  },
   "DEVTOOLS_FONTINSPECTOR_TIME_ACTIVE_SECONDS": {
     "expires_in_version": "never",
     "kind": "exponential",