[Android] Add UMA histograms to measure context menu actions.

chrome/android/java/src/org/chromium/chrome/browser/contextmenu/ChromeContextMenuPopulator.java

Index: chrome/android/java/src/org/chromium/chrome/browser/contextmenu/ChromeContextMenuPopulator.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/contextmenu/ChromeContextMenuPopulator.java b/chrome/android/java/src/org/chromium/chrome/browser/contextmenu/ChromeContextMenuPopulator.java
index 6d7e2d7b8da5fcdfbd0f87847c74cad86f52868c..092759f3e24118582438928039ed6c4bb6b89bb2 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/contextmenu/ChromeContextMenuPopulator.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/contextmenu/ChromeContextMenuPopulator.java
@@ -10,6 +10,7 @@ import android.text.TextUtils;
 import android.view.ContextMenu;
 import android.view.MenuInflater;
 
+import org.chromium.base.metrics.RecordHistogram;
 import org.chromium.chrome.R;
 import org.chromium.chrome.browser.UrlUtilities;
 import org.chromium.chrome.browser.net.spdyproxy.DataReductionProxySettings;
@@ -24,6 +25,48 @@ public class ChromeContextMenuPopulator implements ContextMenuPopulator {
     private MenuInflater mMenuInflater;
     private static final String BLANK_URL = "about:blank";
 
+    static class ContextMenuUma {
+        // Note: these values must match the ContextMenuOption enum in histograms.xml.
+        static final int ACTION_OPEN_IN_NEW_TAB = 0;
+        static final int ACTION_OPEN_IN_INCOGNITO_TAB = 1;
+        static final int ACTION_COPY_LINK_ADDRESS = 2;
+        static final int ACTION_COPY_EMAIL_ADDRESS = 3;
+        static final int ACTION_COPY_LINK_TEXT = 4;
+        static final int ACTION_SAVE_LINK = 5;
+        static final int ACTION_SAVE_IMAGE = 6;
+        static final int ACTION_OPEN_IMAGE = 7;
+        static final int ACTION_OPEN_IMAGE_IN_NEW_TAB = 8;
+        static final int ACTION_COPY_IMAGE = 9;
+        static final int ACTION_COPY_IMAGE_URL = 10;
+        static final int ACTION_SEARCH_BY_IMAGE = 11;
+        static final int ACTION_LOAD_IMAGES = 12;
+        static final int ACTION_LOAD_ORIGINAL_IMAGE = 13;
+        static final int ACTION_SAVE_VIDEO = 14;
+        static final int NUM_ACTIONS = 15;
+
+        /**
+         * Records a histogram entry when the user selects an item from a context menu.
+         * @param params The ContextMenuParams describing the current context menu.
+         * @param action The action that the user selected (e.g. ACTION_SAVE_IMAGE).
+         */
+        static void record(ContextMenuParams params, int action) {
+            assert action >= 0;
+            assert action < NUM_ACTIONS;
+            String histogramName;
+            if (params.isVideo()) {
+                histogramName = "ContextMenu.SelectedOption.Video";
+            } else if (params.isImage()) {
+                histogramName = params.isAnchor()
+                        ? "ContextMenu.SelectedOption.ImageLink"
+                        : "ContextMenu.SelectedOption.Image";
+            } else {
+                assert params.isAnchor();
+                histogramName = "ContextMenu.SelectedOption.Link";
+            }
+            RecordHistogram.recordEnumeratedHistogram(histogramName, action, NUM_ACTIONS);
+        }
+    }
+
     /**
      * Builds a {@link ChromeContextMenuPopulator}.
      * @param delegate The {@link ChromeContextMenuItemDelegate} that will be notified with actions
@@ -136,19 +179,25 @@ public class ChromeContextMenuPopulator implements ContextMenuPopulator {
     @Override
     public boolean onItemSelected(ContextMenuHelper helper, ContextMenuParams params, int itemId) {
         if (itemId == R.id.contextmenu_open_in_new_tab) {
+            ContextMenuUma.record(params, ContextMenuUma.ACTION_OPEN_IN_NEW_TAB);
             mDelegate.onOpenInNewTab(params.getLinkUrl(), params.getReferrer());
         } else if (itemId == R.id.contextmenu_open_in_incognito_tab) {
+            ContextMenuUma.record(params, ContextMenuUma.ACTION_OPEN_IN_INCOGNITO_TAB);
             mDelegate.onOpenInNewIncognitoTab(params.getLinkUrl());
         } else if (itemId == R.id.contextmenu_open_image) {
+            ContextMenuUma.record(params, ContextMenuUma.ACTION_OPEN_IMAGE);
             mDelegate.onOpenImageUrl(params.getSrcUrl(), params.getReferrer());
         } else if (itemId == R.id.contextmenu_open_image_in_new_tab
                 || itemId == R.id.contextmenu_open_original_image_in_new_tab) {
+            ContextMenuUma.record(params, ContextMenuUma.ACTION_OPEN_IMAGE_IN_NEW_TAB);
             mDelegate.onOpenImageInNewTab(params.getSrcUrl(), params.getReferrer());
         } else if (itemId == R.id.contextmenu_load_images) {
+            ContextMenuUma.record(params, ContextMenuUma.ACTION_LOAD_IMAGES);
             DataReductionProxyUma.dataReductionProxyLoFiUIAction(
                     DataReductionProxyUma.ACTION_LOAD_IMAGES_CONTEXT_MENU_CLICKED);
             mDelegate.onReloadIgnoringCache();
         } else if (itemId == R.id.contextmenu_load_original_image) {
+            ContextMenuUma.record(params, ContextMenuUma.ACTION_LOAD_ORIGINAL_IMAGE);
             DataReductionProxyUma.dataReductionProxyLoFiUIAction(
                     DataReductionProxyUma.ACTION_LOAD_IMAGE_CONTEXT_MENU_CLICKED);
             if (!DataReductionProxySettings.getInstance().wasLoFiLoadImageRequestedBefore()) {
@@ -158,32 +207,41 @@ public class ChromeContextMenuPopulator implements ContextMenuPopulator {
             }
             mDelegate.onLoadOriginalImage();
         } else if (itemId == R.id.contextmenu_copy_link_address_text) {
+            ContextMenuUma.record(params, ContextMenuUma.ACTION_COPY_LINK_ADDRESS);
             mDelegate.onSaveToClipboard(params.getUnfilteredLinkUrl(),
                     ChromeContextMenuItemDelegate.CLIPBOARD_TYPE_LINK_URL);
         } else if (itemId == R.id.contextmenu_copy_email_address) {
+            ContextMenuUma.record(params, ContextMenuUma.ACTION_COPY_EMAIL_ADDRESS);
             mDelegate.onSaveToClipboard(MailTo.parse(params.getLinkUrl()).getTo(),
                     ChromeContextMenuItemDelegate.CLIPBOARD_TYPE_LINK_URL);
         } else if (itemId == R.id.contextmenu_copy_link_text) {
+            ContextMenuUma.record(params, ContextMenuUma.ACTION_COPY_LINK_TEXT);
             mDelegate.onSaveToClipboard(
                     params.getLinkText(), ChromeContextMenuItemDelegate.CLIPBOARD_TYPE_LINK_TEXT);
         } else if (itemId == R.id.contextmenu_save_image) {
+            ContextMenuUma.record(params, ContextMenuUma.ACTION_SAVE_IMAGE);
             if (mDelegate.startDownload(params.getSrcUrl(), false)) {
                 helper.startContextMenuDownload(
                         false, mDelegate.isDataReductionProxyEnabledForURL(params.getSrcUrl()));
             }
         } else if (itemId == R.id.contextmenu_save_video) {
+            ContextMenuUma.record(params, ContextMenuUma.ACTION_SAVE_VIDEO);
             if (mDelegate.startDownload(params.getSrcUrl(), false)) {
                 helper.startContextMenuDownload(false, false);
             }
         } else if (itemId == R.id.contextmenu_save_link_as) {
+            ContextMenuUma.record(params, ContextMenuUma.ACTION_SAVE_LINK);
             if (mDelegate.startDownload(params.getUnfilteredLinkUrl(), true)) {
                 helper.startContextMenuDownload(true, false);
             }
         } else if (itemId == R.id.contextmenu_search_by_image) {
+            ContextMenuUma.record(params, ContextMenuUma.ACTION_SEARCH_BY_IMAGE);
             mDelegate.onSearchByImageInNewTab();
         } else if (itemId == R.id.contextmenu_copy_image) {
+            ContextMenuUma.record(params, ContextMenuUma.ACTION_COPY_IMAGE);
             mDelegate.onSaveImageToClipboard(params.getSrcUrl());
         } else if (itemId == R.id.contextmenu_copy_image_url) {
+            ContextMenuUma.record(params, ContextMenuUma.ACTION_COPY_IMAGE_URL);
             mDelegate.onSaveToClipboard(
                     params.getSrcUrl(), ChromeContextMenuItemDelegate.CLIPBOARD_TYPE_IMAGE_URL);
         } else {