Fix remaining createScreenshot references

Fixed references to createScreenshot method which was returning a null
bitmap. createScreenshot method was implemented using the older
getViewportBitmap synchronous API which was deprecated. WebView exposes
an asynchronous method getContentBitmapAsync to retrieve a bitmap of the
current view. Modified calls to use the getContentBitmapAsync API.
This also fixes the issue seen where an async task was fired in a loop
to retrieve the bitmap resulting in wasted CPU cycles.

Change-Id: Ic6d8385d41d90c58fdffcebcbca7ebd68381530f
diff --git a/src/com/android/browser/Tab.java b/src/com/android/browser/Tab.java
index 861d68f..d4d6cba 100644
--- a/src/com/android/browser/Tab.java
+++ b/src/com/android/browser/Tab.java
@@ -1989,7 +1989,7 @@
     /**
      * Must be called on the UI thread
      */
-    public ContentValues createSnapshotValues() {
+    public ContentValues createSnapshotValues(Bitmap bm) {
         WebView web = getWebView();
         if (web == null) return null;
         ContentValues values = new ContentValues();
@@ -1998,10 +1998,7 @@
         values.put(Snapshots.BACKGROUND, web.getPageBackgroundColor());
         values.put(Snapshots.DATE_CREATED, System.currentTimeMillis());
         values.put(Snapshots.FAVICON, compressBitmap(getFavicon()));
-        Bitmap screenshot = Controller.createScreenshot(web,
-                Controller.getDesiredThumbnailWidth(mWebViewController.getActivity()),
-                Controller.getDesiredThumbnailHeight(mWebViewController.getActivity()));
-        values.put(Snapshots.THUMBNAIL, compressBitmap(screenshot));
+        values.put(Snapshots.THUMBNAIL, compressBitmap(bm));
         return values;
     }