Upstream oodles of Chrome for Android code into Chromium.

chrome/android/java_staging/src/org/chromium/chrome/browser/ntp/NewTabPageUma.java

Index: chrome/android/java_staging/src/org/chromium/chrome/browser/ntp/NewTabPageUma.java
diff --git a/chrome/android/java_staging/src/org/chromium/chrome/browser/ntp/NewTabPageUma.java b/chrome/android/java_staging/src/org/chromium/chrome/browser/ntp/NewTabPageUma.java
new file mode 100644
index 0000000000000000000000000000000000000000..dfe117ea44b29099b954f50c019877c88a9d3f78
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+++ b/chrome/android/java_staging/src/org/chromium/chrome/browser/ntp/NewTabPageUma.java
@@ -0,0 +1,78 @@
+// 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.
+
+package org.chromium.chrome.browser.ntp;
+
+import org.chromium.base.metrics.RecordHistogram;
+import org.chromium.base.metrics.RecordUserAction;
+import org.chromium.chrome.browser.UrlUtilities;
+import org.chromium.ui.base.PageTransition;
+
+/**
+ * Records UMA stats for which actions the user takes on the NTP in the
+ * "NewTabPage.ActionAndroid" histogram.
+ */
+public class NewTabPageUma {
+    // Possible actions taken by the user on the NTP. These values are also defined in
+    // histograms.xml. WARNING: these values must stay in sync with histograms.xml.
+
+    // User performed a search using the omnibox
+    private static final int ACTION_SEARCHED_USING_OMNIBOX = 0;
+    // User navigated to Google search homepage using the omnibox
+    private static final int ACTION_NAVIGATED_TO_GOOGLE_HOMEPAGE = 1;
+    // User navigated to any other page using the omnibox
+    private static final int ACTION_NAVIGATED_USING_OMNIBOX = 2;
+    // User opened a most visited page
+    public static final int ACTION_OPENED_MOST_VISITED_ENTRY = 3;
+    // User opened a recently closed tab
+    public static final int ACTION_OPENED_RECENTLY_CLOSED_ENTRY = 4;
+    // User opened a bookmark
+    public static final int ACTION_OPENED_BOOKMARK = 5;
+    // User opened a foreign session (from recent tabs section)
+    public static final int ACTION_OPENED_FOREIGN_SESSION = 6;
+    // The number of possible actions
+    private static final int NUM_ACTIONS = 7;
+
+    /**
+     * Records an action taken by the user on the NTP.
+     * @param action One of the ACTION_* values defined in this class.
+     */
+    public static void recordAction(int action) {
+        assert action >= 0;
+        assert action < NUM_ACTIONS;
+        switch (action) {
+            case ACTION_OPENED_MOST_VISITED_ENTRY:
+                RecordUserAction.record("MobileNTPMostVisited");
+                break;
+            case ACTION_OPENED_RECENTLY_CLOSED_ENTRY:
+                RecordUserAction.record("MobileNTPRecentlyClosed");
+                break;
+            case ACTION_OPENED_BOOKMARK:
+                RecordUserAction.record("MobileNTPBookmark");
+                break;
+            case ACTION_OPENED_FOREIGN_SESSION:
+                RecordUserAction.record("MobileNTPForeignSession");
+                break;
+            default:
+                // No UMA action associated with this type.
+                break;
+        }
+        RecordHistogram.recordEnumeratedHistogram("NewTabPage.ActionAndroid", action, NUM_ACTIONS);
+    }
+
+    /**
+     * Record that the user has navigated away from the NTP using the omnibox.
+     * @param destinationUrl The URL to which the user navigated.
+     * @param transitionType The transition type of the navigation, from PageTransition.java.
+     */
+    public static void recordOmniboxNavigation(String destinationUrl, int transitionType) {
+        if ((transitionType & PageTransition.CORE_MASK) == PageTransition.GENERATED) {
+            recordAction(ACTION_SEARCHED_USING_OMNIBOX);
+        } else if (UrlUtilities.nativeIsGoogleHomePageUrl(destinationUrl)) {
+            recordAction(ACTION_NAVIGATED_TO_GOOGLE_HOMEPAGE);
+        } else {
+            recordAction(ACTION_NAVIGATED_USING_OMNIBOX);
+        }
+    }
+}