Bug 1245493 - Add comments to existing code to clarify them. r=margaret

MozReview-Commit-ID: KwOy1KMoPaY

--HG--
extra : rebase_source : c91e633f84b5b8444061fd04a34bd6b17b09abd3

mobile/android/base/java/org/mozilla/gecko/Tab.java

@@ -64,6 +64,8 @@ public class Tab {
     private SiteLogins mSiteLogins;
     private BitmapDrawable mThumbnail;
     private final int mParentId;
+    // Indicates the url was loaded from a source external to the app. This will be cleared
+    // when the user explicitly loads a new url (e.g. clicking a link is not explicit).
     private final boolean mExternal;
     private boolean mBookmark;
     private int mFaviconLoadId;

mobile/android/base/java/org/mozilla/gecko/Tabs.java

@@ -63,6 +63,7 @@ public class Tabs implements GeckoEventListener {
     public static final int LOADURL_DELAY_LOAD   = 1 << 4;
     public static final int LOADURL_DESKTOP      = 1 << 5;
     public static final int LOADURL_BACKGROUND   = 1 << 6;
+    /** Indicates the url has been specified by a source external to the app. */
     public static final int LOADURL_EXTERNAL     = 1 << 7;
 
     private static final long PERSIST_TABS_AFTER_MILLISECONDS = 1000 * 2;