Add UMA metrics for Bookmark widgets.

chrome/android/java/src/org/chromium/chrome/browser/bookmarkswidget/BookmarkWidgetProxy.java

Index: chrome/android/java/src/org/chromium/chrome/browser/bookmarkswidget/BookmarkWidgetProxy.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/bookmarkswidget/BookmarkWidgetProxy.java b/chrome/android/java/src/org/chromium/chrome/browser/bookmarkswidget/BookmarkWidgetProxy.java
index 527097c1b1bae7acc7f3976d0a6b66ca437ec2f1..f9ecc8c1f8c6ae222c001895a1b367f86df541ad 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/bookmarkswidget/BookmarkWidgetProxy.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/bookmarkswidget/BookmarkWidgetProxy.java
@@ -9,6 +9,11 @@ import android.content.Context;
 import android.content.Intent;
 import android.util.Log;
 
+import org.chromium.chrome.browser.BookmarkUtils;
+import org.chromium.chrome.browser.ShortcutHelper;
+import org.chromium.chrome.browser.Source;
+import org.chromium.chrome.browser.document.ChromeLauncherActivity;
+
 /**
  * Proxy that responds to tapping on the Bookmarks widget.
  */
@@ -23,6 +28,9 @@ public class BookmarkWidgetProxy extends BroadcastReceiver {
         } else {
             Intent view = new Intent(intent);
             view.setComponent(null);

[newt (away), 2015/07/15 02:56:00]

This line isn't needed anymore since setClass() overrides the component value.

[aurimas (slooooooooow), 2015/07/16 01:15:31]

Done

+            view.setClass(context, ChromeLauncherActivity.class);
+            view.putExtra(ShortcutHelper.EXTRA_SOURCE, Source.BOOKMARK_NAVIGATOR_WIDGET);
+            view.putExtra(BookmarkUtils.REUSE_URL_MATCHING_TAB_ELSE_NEW_TAB, true);
             startActivity(context, view);
         }
     }