Enable fullscreen support

Always allow the tab to go fullscreen. Explicit call to
exit fullscreen is added.  Fullscreen layout logic moved
to base ui class.

Change-Id: I4474d90f99bf4753dedbe453b21f126668c40f64
diff --git a/src/com/android/browser/BrowserSettings.java b/src/com/android/browser/BrowserSettings.java
index e8ecd93..2a3a171 100644
--- a/src/com/android/browser/BrowserSettings.java
+++ b/src/com/android/browser/BrowserSettings.java
@@ -374,6 +374,7 @@
         // origin policy for file access
         settings.setAllowUniversalAccessFromFileURLs(false);
         settings.setAllowFileAccessFromFileURLs(false);
+        settings.setFullscreenSupported(true);
 
         //if (!(settings instanceof WebSettingsClassic)) return;
         /*