Support "display": "fullscreen" for sites added to the home screen.

chrome/android/java/src/org/chromium/chrome/browser/webapps/WebappActivity.java

Index: chrome/android/java/src/org/chromium/chrome/browser/webapps/WebappActivity.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/webapps/WebappActivity.java b/chrome/android/java/src/org/chromium/chrome/browser/webapps/WebappActivity.java
index 7a35c67a8ce7a90cbdfc875aec890b77f31d55d4..decc0b3403875352b6f0ee539fcf176ea70e7918 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/webapps/WebappActivity.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/webapps/WebappActivity.java
@@ -92,8 +92,6 @@ public class WebappActivity extends FullScreenActivity {
             mWebappInfo = newWebappInfo;
             resetSavedInstanceState();
             if (mIsInitialized) initializeUI(null);
-            // TODO(dominickn): send the web app into fullscreen if mDisplayMode is
-            // WebDisplayMode.Fullscreen. See crbug.com/581522
         }
     }
 
@@ -118,9 +116,10 @@ public class WebappActivity extends FullScreenActivity {
 
         getActivityTab().addObserver(createTabObserver());
         getActivityTab().getTabWebContentsDelegateAndroid().setDisplayMode(
-                WebDisplayMode.Standalone);
-        // TODO(dominickn): send the web app into fullscreen if mDisplayMode is
-        // WebDisplayMode.Fullscreen. See crbug.com/581522
+                mWebappInfo.displayMode());
+        if (mWebappInfo.displayMode() == WebDisplayMode.Fullscreen) {
+            enterImmersiveMode(getWindow().getDecorView());
+        }
     }
 
     @Override