Make WebContentsObserver pass more calls to Java.

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

Index: content/public/android/java/src/org/chromium/content/browser/WebContentsObserver.java
diff --git a/content/public/android/java/src/org/chromium/content/browser/WebContentsObserver.java b/content/public/android/java/src/org/chromium/content/browser/WebContentsObserver.java
index 4a98e9235754df84c9d35d6119569ba12edcfe7f..77e0a6195de2ed7d8751df4c91cedaafa3aa6469 100644
--- a/content/public/android/java/src/org/chromium/content/browser/WebContentsObserver.java
+++ b/content/public/android/java/src/org/chromium/content/browser/WebContentsObserver.java
@@ -22,6 +22,14 @@ public abstract class WebContentsObserver {
         mNativeWebContentsObserverAndroid = nativeInit(webContents);
     }
 
+    /**
+     * Called when the RenderView of the current RenderViewHost is ready, e.g. because we recreated
+     * it after a crash.
+     */
+    @CalledByNative
+    public void renderViewReady() {
+    }
+
     @CalledByNative
     public void renderProcessGone(boolean wasOomProtected) {
     }
@@ -99,6 +107,13 @@ public abstract class WebContentsObserver {
     }
 
     /**
+     * Called once the window.document object of the main frame was created.
+     */
+    @CalledByNative
+    public void documentAvailableInMainFrame() {
+    }
+
+    /**
      * Notifies that a load is started for a given frame.
      * @param frameId A positive, non-zero integer identifying the navigating frame.
      * @param parentFrameId The frame identifier of the frame containing the navigating frame,