WebContentsObserver update for PlzNavigate methods

content/public/android/java/src/org/chromium/content_public/browser/WebContentsObserver.java

Index: content/public/android/java/src/org/chromium/content_public/browser/WebContentsObserver.java
diff --git a/content/public/android/java/src/org/chromium/content_public/browser/WebContentsObserver.java b/content/public/android/java/src/org/chromium/content_public/browser/WebContentsObserver.java
index c947e078e6a61e0294c718f9262f09bd2f6c62fd..ef0f43d09676235c7d8597f3fceb74fdc43dd34a 100644
--- a/content/public/android/java/src/org/chromium/content_public/browser/WebContentsObserver.java
+++ b/content/public/android/java/src/org/chromium/content_public/browser/WebContentsObserver.java
@@ -29,18 +29,32 @@ public abstract class WebContentsObserver {
 
     public void renderProcessGone(boolean wasOomProtected) {}
 
+    // plzNavigate methods.

[Maria, 2016/12/27 19:31:10]

this comment is probably not necessary here. I would instead put @Deprecated
tags on the methods we are replacing.

+
+    /**
+     * Called when the browser process starts a navigation.
+     * @param navigation The current navigation.
+     */
+    public void didStartNavigation(NavigationHandle navigation) {}
+
     /**
-     * Called when the current navigation finishes.
-     *
-     * @param isMainFrame Whether the navigation is for the main frame.
-     * @param isErrorPage Whether the navigation shows an error page.
-     * @param hasCommitted Whether the navigation has committed. This returns true for either
-     *                     successful commits or error pages that replace the previous page
-     *                     (distinguished by |isErrorPage|), and false for errors that leave the
-     *                     user on the previous page.
-     */
-    public void didFinishNavigation(
-            boolean isMainFrame, boolean isErrorPage, boolean hasCommitted) {}
+     * Called when navigation is redirected.
+     * @param navigation The current navigation.
+     */
+    public void didRedirectNavigation(NavigationHandle navigation) {}
+
+    /**
+     * Called when the current navigation is associated with a RenderFrameHost for the first time.
+     * @param navigation The current navigation.
+     */
+    public void readyToCommitNavigation(NavigationHandle navigation) {}
+
+    /**
+     * Called when the current navigation is finished. This happens when a navigation is committed,
+     * aborted or replaced by a new one.
+     * @param navigation The current navigation.
+     */
+    public void didFinishNavigation(NavigationHandle navigation) {}
 
     /**
      * Called when the a page starts loading.