[Android WebAPK] Add UMA for whether WebAPK navigation is in scope

This CL adds a new UMA metric WebApk.Navigation.InScope which is
recorded on every WebAPK navigation. It records whether WebAPK
navigations are within the WebAPK's scope.

BUG=999648

Change-Id: I0d8fc678f396e8fd55c48aabd41b8878ee8fdcd6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1788304
Commit-Queue: Peter Kotwicz <pkotwicz@chromium.org>
Reviewed-by: Dominick Ng <dominickn@chromium.org>
Reviewed-by: Robert Kaplow <rkaplow@chromium.org>
Cr-Commit-Position: refs/heads/master@{#695828}

chrome/android/java/src/org/chromium/chrome/browser/metrics/WebApkUma.java

@@ -305,6 +305,13 @@ public class WebApkUma {
         RecordHistogram.recordSparseHistogram("WebApk.Launch.NetworkError", -errorCode);
     }
 
+    /**
+     * Records whether a WebAPK navigation is within the WebAPK's scope.
+     */
+    public static void recordNavigation(boolean isNavigationInScope) {
+        RecordHistogram.recordBooleanHistogram("WebApk.Navigation.InScope", isNavigationInScope);
+    }
+
     /**
      * Log necessary disk usage and cache size UMAs when WebAPK installation fails.
      */

chrome/android/java/src/org/chromium/chrome/browser/webapps/WebappActivity.java

@@ -41,6 +41,7 @@ import org.chromium.chrome.browser.compositor.layouts.LayoutManager;
 import org.chromium.chrome.browser.customtabs.CustomTabAppMenuPropertiesDelegate;
 import org.chromium.chrome.browser.document.ChromeLauncherActivity;
 import org.chromium.chrome.browser.document.DocumentUtils;
+import org.chromium.chrome.browser.metrics.WebApkUma;
 import org.chromium.chrome.browser.tab.EmptyTabObserver;
 import org.chromium.chrome.browser.tab.Tab;
 import org.chromium.chrome.browser.tab.TabBrowserControlsState;
@@ -600,13 +601,17 @@ public class WebappActivity extends SingleTabActivity {
 
                     updateToolbarCloseButtonVisibility();
 
-                    if (!WebappScopePolicy.isUrlInScope(
-                                scopePolicy(), mWebappInfo, navigation.getUrl())) {
+                    boolean isNavigationInScope = WebappScopePolicy.isUrlInScope(
+                            scopePolicy(), mWebappInfo, navigation.getUrl());
+                    if (!isNavigationInScope) {
                         // Briefly show the toolbar for off-scope navigations.
                         getFullscreenManager()
                                 .getBrowserVisibilityDelegate()
                                 .showControlsTransient();
                     }
+                    if (mWebappInfo.isForWebApk()) {
+                        WebApkUma.recordNavigation(isNavigationInScope);
+                    }
                 }
             }
 

tools/metrics/histograms/histograms.xml

@@ -153197,6 +153197,17 @@ regressions. -->
   </summary>
 </histogram>
 
+<histogram name="WebApk.Navigation.InScope" enum="Boolean"
+    expires_after="2020-04-01">
+  <owner>hartmanng@chromium.org</owner>
+  <owner>pkotwicz@chromium.org</owner>
+  <owner>yfriedman@chromium.org</owner>
+  <summary>
+    Recorded each time that a WebAPK is navigated. Records whether the
+    navigation is within the scope of the WebAPK's Web Manifest.
+  </summary>
+</histogram>
+
 <histogram name="WebApk.Notification.Permission.Status"
     enum="BooleanWebApkNotificationPermission" expires_after="2020-02-23">
   <owner>hanxi@chromium.org</owner>