Add UKM for Kaleidoscope navigations

Add a UKM to track navigations when a user clicks
on something in Kaleidoscope.

BUG=1110373

Doc:  https://docs.google.com/document/d/1RRF7XpUss7vr-qD4ckmOPyiQrfjQUTLip2YTDkXjchY/edit

Change-Id: Ib0afa41e997aec8cee9bcdc010030cc086a6fcff
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2441289
Commit-Queue: Becca Hughes <beccahughes@chromium.org>
Reviewed-by: Brian White <bcwhite@chromium.org>
Reviewed-by: Robert Kaplow <rkaplow@chromium.org>
Cr-Commit-Position: refs/heads/master@{#818143}

chrome/browser/media/kaleidoscope/kaleidoscope_tab_helper.cc

@@ -7,6 +7,9 @@
 #include "base/metrics/histogram_functions.h"
 #include "chrome/browser/media/kaleidoscope/constants.h"
 #include "content/public/browser/navigation_handle.h"
+#include "services/metrics/public/cpp/ukm_builders.h"
+#include "services/metrics/public/cpp/ukm_entry_builder.h"
+#include "services/metrics/public/cpp/ukm_recorder.h"
 #include "third_party/blink/public/common/associated_interfaces/associated_interface_provider.h"
 #include "third_party/blink/public/mojom/autoplay/autoplay.mojom.h"
 
@@ -80,6 +83,15 @@ void KaleidoscopeTabHelper::ReadyToCommitNavigation(
   if (IsOpenedFromKaleidoscope(handle)) {
     base::UmaHistogramEnumeration(kKaleidoscopeNavigationHistogramName,
                                   KaleidoscopeNavigation::kNormal);
+
+    ukm::UkmRecorder* ukm_recorder = ukm::UkmRecorder::Get();
+    if (!ukm_recorder)
+      return;
+
+    ukm::builders::Media_Kaleidoscope_Navigation(
+        handle->GetNextPageUkmSourceId())
+        .SetWasFromKaleidoscope(true)
+        .Record(ukm_recorder);
   }
 }
 

tools/metrics/ukm/ukm.xml

@@ -6615,6 +6615,21 @@ be describing additional metrics about the same event.
   </metric>
 </event>
 
+<event name="Media.Kaleidoscope.Navigation">
+  <owner>beccahughes@chromium.org</owner>
+  <owner>media-dev@chromium.org</owner>
+  <summary>
+    Kaleidoscope is a media recommendations feature in Chrome. This event is
+    recorded when a user selects a media recommendation and there is a
+    navigation to the new site from Kaleidoscope.
+  </summary>
+  <metric name="WasFromKaleidoscope">
+    <summary>
+      Whether the navigation was from Kaleiodscope.
+    </summary>
+  </metric>
+</event>
+
 <event name="Media.Learning.PredictionRecord">
   <owner>liberato@chromium.org</owner>
   <summary>