Hide the page info dialog if the underlying webcontents is hidden.

content/public/android/java/src/org/chromium/content/browser/webcontents/WebContentsObserverProxy.java

Index: content/public/android/java/src/org/chromium/content/browser/webcontents/WebContentsObserverProxy.java
diff --git a/content/public/android/java/src/org/chromium/content/browser/webcontents/WebContentsObserverProxy.java b/content/public/android/java/src/org/chromium/content/browser/webcontents/WebContentsObserverProxy.java
index f3e2c6a9f860d88c78103ceb205fe86ae57e6c5d..365811066e556c685eed2f61288dc6209780f153 100644
--- a/content/public/android/java/src/org/chromium/content/browser/webcontents/WebContentsObserverProxy.java
+++ b/content/public/android/java/src/org/chromium/content/browser/webcontents/WebContentsObserverProxy.java
@@ -140,6 +140,22 @@ class WebContentsObserverProxy extends WebContentsObserver {
 
     @Override
     @CalledByNative
+    public void wasShown() {
+        for (mObserversIterator.rewind(); mObserversIterator.hasNext();) {
+            mObserversIterator.next().wasShown();
+        }
+    }
+
+    @Override
+    @CalledByNative
+    public void wasHidden() {
+        for (mObserversIterator.rewind(); mObserversIterator.hasNext();) {
+            mObserversIterator.next().wasHidden();
+        }
+    }
+
+    @Override
+    @CalledByNative
     public void didNavigateAnyFrame(String url, String baseUrl, boolean isReload) {
         for (mObserversIterator.rewind(); mObserversIterator.hasNext();) {
             mObserversIterator.next().didNavigateAnyFrame(url, baseUrl, isReload);