Make mouse wheel events trigger WebContentsObserver::DidGetUserInteraction.

chrome/browser/engagement/site_engagement_helper_unittest.cc

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "base/command_line.h"
 #include "base/test/histogram_tester.h"
 #include "base/timer/mock_timer.h"
 #include "base/values.h"
 #include "chrome/browser/engagement/site_engagement_helper.h"
 #include "chrome/browser/engagement/site_engagement_service.h"
@@ skipping 100 matching lines @@
     EXPECT_DOUBLE_EQ(0.7, service->GetScore(url1));
     EXPECT_DOUBLE_EQ(0.55, service->GetScore(url2));
     EXPECT_DOUBLE_EQ(1.25, service->GetTotalEngagementPoints());
   }
 };
 
 TEST_F(SiteEngagementHelperTest, KeyPressEngagementAccumulation) {
   UserInputAccumulation(blink::WebInputEvent::RawKeyDown);
 }
 
-TEST_F(SiteEngagementHelperTest, MouseEventEngagementAccumulation) {
+TEST_F(SiteEngagementHelperTest, MouseDownEventEngagementAccumulation) {
   UserInputAccumulation(blink::WebInputEvent::MouseDown);
 }
 
+TEST_F(SiteEngagementHelperTest, MouseWheelEventEngagementAccumulation) {
+  UserInputAccumulation(blink::WebInputEvent::MouseWheel);
+}
+
 TEST_F(SiteEngagementHelperTest, GestureEngagementAccumulation) {
   UserInputAccumulation(blink::WebInputEvent::GestureTapDown);
 }
 
 TEST_F(SiteEngagementHelperTest, MixedInputEngagementAccumulation) {
   AddTab(browser(), GURL("about:blank"));
   GURL url1("https://www.google.com/");
   GURL url2("http://www.google.com/");
   content::WebContents* web_contents =
     browser()->tab_strip_model()->GetActiveWebContents();
@@ skipping 38 matching lines @@
                                SiteEngagementMetrics::ENGAGEMENT_NAVIGATION, 1);
   histograms.ExpectBucketCount(SiteEngagementMetrics::kEngagementTypeHistogram,
                                SiteEngagementMetrics::ENGAGEMENT_KEYPRESS, 2);
   histograms.ExpectBucketCount(SiteEngagementMetrics::kEngagementTypeHistogram,
                                SiteEngagementMetrics::ENGAGEMENT_MOUSE, 1);
   histograms.ExpectBucketCount(SiteEngagementMetrics::kEngagementTypeHistogram,
                                SiteEngagementMetrics::ENGAGEMENT_TOUCH_GESTURE,
                                2);
 
   HandleUserInputAndRestartTracking(helper.get(),
-                                    blink::WebInputEvent::MouseDown);
+                                    blink::WebInputEvent::MouseWheel);
   HandleUserInputAndRestartTracking(helper.get(),
                                     blink::WebInputEvent::MouseDown);
   HandleUserInputAndRestartTracking(helper.get(),
                                     blink::WebInputEvent::GestureTapDown);
 
   EXPECT_DOUBLE_EQ(0.9, service->GetScore(url1));
   EXPECT_EQ(0, service->GetScore(url2));
   histograms.ExpectTotalCount(SiteEngagementMetrics::kEngagementTypeHistogram,
                               9);
   histograms.ExpectBucketCount(SiteEngagementMetrics::kEngagementTypeHistogram,
-                               SiteEngagementMetrics::ENGAGEMENT_MOUSE, 3);
+                               SiteEngagementMetrics::ENGAGEMENT_MOUSE, 2);
+  histograms.ExpectBucketCount(SiteEngagementMetrics::kEngagementTypeHistogram,
+                               SiteEngagementMetrics::ENGAGEMENT_WHEEL, 1);
   histograms.ExpectBucketCount(SiteEngagementMetrics::kEngagementTypeHistogram,
                                SiteEngagementMetrics::ENGAGEMENT_TOUCH_GESTURE,
                                3);
 
   NavigateWithDisposition(url2, CURRENT_TAB);
   StartTracking(helper.get());
 
   EXPECT_DOUBLE_EQ(0.9, service->GetScore(url1));
   EXPECT_DOUBLE_EQ(0.5, service->GetScore(url2));
   EXPECT_DOUBLE_EQ(1.4, service->GetTotalEngagementPoints());
@@ skipping 148 matching lines @@
   // When the timer fires, callbacks are added.
   input_tracker_timer->Fire();
   EXPECT_FALSE(input_tracker_timer->IsRunning());
   EXPECT_TRUE(IsTracking(helper.get()));
 
   // Navigation should start the initial delay timer again.
   NavigateWithDisposition(url1, CURRENT_TAB);
   EXPECT_TRUE(input_tracker_timer->IsRunning());
   EXPECT_FALSE(IsTracking(helper.get()));
 }