Set up the infrastructure for Extension event metrics.

extensions/renderer/event_unittest.cc

Index: extensions/renderer/event_unittest.cc
diff --git a/extensions/renderer/event_unittest.cc b/extensions/renderer/event_unittest.cc
index 9d3b68f0014980dffae42b48e934db200af85446..06398bd54d729eaf544a088013f26277b24fb695 100644
--- a/extensions/renderer/event_unittest.cc
+++ b/extensions/renderer/event_unittest.cc
@@ -79,7 +79,7 @@ TEST_F(EventUnittest, AddRemoveTwoListeners) {
       "var assert = requireNative('assert');"
       "var Event = require('event_bindings').Event;"
       "var eventNatives = requireNative('event_natives');"
-      "var myEvent = new Event('named-event');"
+      "var myEvent = new Event(events::UNKNOWN, 'named-event');"
       "var cb1 = function() {};"
       "var cb2 = function() {};"
       "myEvent.addListener(cb1);"
@@ -94,18 +94,18 @@ TEST_F(EventUnittest, AddRemoveTwoListeners) {
 TEST_F(EventUnittest, EventsThatSupportRulesMustHaveAName) {
   ModuleSystem::NativesEnabledScope natives_enabled_scope(
       env()->module_system());
-  env()->RegisterModule(
-      "test",
-      "var Event = require('event_bindings').Event;"
-      "var eventOpts = {supportsRules: true};"
-      "var assert = requireNative('assert');"
-      "var caught = false;"
-      "try {"
-      "  var myEvent = new Event(undefined, undefined, eventOpts);"
-      "} catch (e) {"
-      "  caught = true;"
-      "}"
-      "assert.AssertTrue(caught);");
+  env()->RegisterModule("test",
+                        "var Event = require('event_bindings').Event;"
+                        "var eventOpts = {supportsRules: true};"
+                        "var assert = requireNative('assert');"
+                        "var caught = false;"
+                        "try {"
+                        "  var myEvent = new Event(events::UNKNOWN, undefined, "
+                        "undefined, eventOpts);"
+                        "} catch (e) {"
+                        "  caught = true;"
+                        "}"
+                        "assert.AssertTrue(caught);");
   env()->module_system()->Require("test");
 }
 
@@ -117,7 +117,7 @@ TEST_F(EventUnittest, NamedEventDispatch) {
       "var Event = require('event_bindings').Event;"
       "var dispatchEvent = require('event_bindings').dispatchEvent;"
       "var assert = requireNative('assert');"
-      "var e = new Event('myevent');"
+      "var e = new Event(events::UNKNOWN, 'myevent');"
       "var called = false;"
       "e.addListener(function() { called = true; });"
       "dispatchEvent('myevent', []);"
@@ -131,7 +131,7 @@ TEST_F(EventUnittest, AddListenerWithFiltersThrowsErrorByDefault) {
   env()->RegisterModule("test",
                         "var Event = require('event_bindings').Event;"
                         "var assert = requireNative('assert');"
-                        "var e = new Event('myevent');"
+                        "var e = new Event(events::UNKNOWN, 'myevent');"
                         "var filter = [{"
                         "  url: {hostSuffix: 'google.com'},"
                         "}];"
@@ -154,7 +154,7 @@ TEST_F(EventUnittest, FilteredEventsAttachment) {
       "var assert = requireNative('assert');"
       "var bindings = requireNative('event_natives');"
       "var eventOpts = {supportsListeners: true, supportsFilters: true};"
-      "var e = new Event('myevent', undefined, eventOpts);"
+      "var e = new Event(events::UNKNOWN, 'myevent', undefined, eventOpts);"
       "var cb = function() {};"
       "var filters = {url: [{hostSuffix: 'google.com'}]};"
       "e.addListener(cb, filters);"
@@ -173,7 +173,7 @@ TEST_F(EventUnittest, DetachFilteredEvent) {
       "var assert = requireNative('assert');"
       "var bindings = requireNative('event_natives');"
       "var eventOpts = {supportsListeners: true, supportsFilters: true};"
-      "var e = new Event('myevent', undefined, eventOpts);"
+      "var e = new Event(events::UNKNOWN, 'myevent', undefined, eventOpts);"
       "var cb1 = function() {};"
       "var cb2 = function() {};"
       "var filters = {url: [{hostSuffix: 'google.com'}]};"
@@ -193,7 +193,7 @@ TEST_F(EventUnittest, AttachAndRemoveSameFilteredEventListener) {
       "var assert = requireNative('assert');"
       "var bindings = requireNative('event_natives');"
       "var eventOpts = {supportsListeners: true, supportsFilters: true};"
-      "var e = new Event('myevent', undefined, eventOpts);"
+      "var e = new Event(events::UNKNOWN, 'myevent', undefined, eventOpts);"
       "var cb = function() {};"
       "var filters = {url: [{hostSuffix: 'google.com'}]};"
       "e.addListener(cb, filters);"
@@ -214,7 +214,7 @@ TEST_F(EventUnittest, AddingFilterWithUrlFieldNotAListThrowsException) {
       "var Event = require('event_bindings').Event;"
       "var assert = requireNative('assert');"
       "var eventOpts = {supportsListeners: true, supportsFilters: true};"
-      "var e = new Event('myevent', undefined, eventOpts);"
+      "var e = new Event(events::UNKNOWN, 'myevent', undefined, eventOpts);"
       "var cb = function() {};"
       "var filters = {url: {hostSuffix: 'google.com'}};"
       "var caught = false;"
@@ -235,7 +235,7 @@ TEST_F(EventUnittest, MaxListeners) {
       "var Event = require('event_bindings').Event;"
       "var assert = requireNative('assert');"
       "var eventOpts = {supportsListeners: true, maxListeners: 1};"
-      "var e = new Event('myevent', undefined, eventOpts);"
+      "var e = new Event(events::UNKNOWN, 'myevent', undefined, eventOpts);"
       "var cb = function() {};"
       "var caught = false;"
       "try {"