Report user actions when gesture starts and stops in user_model.

components/scheduler/renderer/user_model_unittest.cc

Index: components/scheduler/renderer/user_model_unittest.cc
diff --git a/components/scheduler/renderer/user_model_unittest.cc b/components/scheduler/renderer/user_model_unittest.cc
index ebf3ff345c7bbbc282029049de09f4e450d548be..c27ae041b38fb5a34041ae34a0d03fc90d48e609 100644
--- a/components/scheduler/renderer/user_model_unittest.cc
+++ b/components/scheduler/renderer/user_model_unittest.cc
@@ -5,6 +5,7 @@
 #include "components/scheduler/renderer/user_model.h"
 
 #include "base/test/simple_test_tick_clock.h"
+#include "base/test/test_simple_task_runner.h"
 #include "testing/gmock/include/gmock/gmock.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
@@ -12,14 +13,14 @@ namespace scheduler {
 
 class UserModelTest : public testing::Test {
  public:
-  UserModelTest() {}
+  UserModelTest() : mock_task_runner_(new base::TestSimpleTaskRunner()) {}
   ~UserModelTest() override {}
 
   void SetUp() override {
     clock_.reset(new base::SimpleTestTickClock());
     clock_->Advance(base::TimeDelta::FromMicroseconds(5000));
 
-    user_model_.reset(new UserModel());
+    user_model_.reset(new UserModel(mock_task_runner_));
   }
 
  protected:
@@ -35,6 +36,7 @@ class UserModelTest : public testing::Test {
 
   scoped_ptr<base::SimpleTestTickClock> clock_;
   scoped_ptr<UserModel> user_model_;
+  scoped_refptr<base::TestSimpleTaskRunner> mock_task_runner_;
 };
 
 TEST_F(UserModelTest, TimeLeftInUserGesture_NoInput) {