Support immersive fullscreen for non-video element

chrome/android/java/src/org/chromium/chrome/browser/fullscreen/FullscreenHtmlApiHandler.java

Index: chrome/android/java/src/org/chromium/chrome/browser/fullscreen/FullscreenHtmlApiHandler.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/fullscreen/FullscreenHtmlApiHandler.java b/chrome/android/java/src/org/chromium/chrome/browser/fullscreen/FullscreenHtmlApiHandler.java
index 344496951d0dcf50dcb8e0061ec91f1b6e71a7ca..2c666c7e2c2c23adaa19c03e49756ad4b206a463 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/fullscreen/FullscreenHtmlApiHandler.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/fullscreen/FullscreenHtmlApiHandler.java
@@ -251,6 +251,7 @@ public class FullscreenHtmlApiHandler {
         if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN_MR2) {
             systemUiVisibility &= ~SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN;
             systemUiVisibility &= ~SYSTEM_UI_FLAG_FULLSCREEN;
+            systemUiVisibility &= ~getExtraFullscreenUIFlags();
         } else {
             mWindow.addFlags(WindowManager.LayoutParams.FLAG_FORCE_NOT_FULLSCREEN);
             mWindow.clearFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN);
@@ -294,6 +295,7 @@ public class FullscreenHtmlApiHandler {
             } else {
                 systemUiVisibility |= SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN;
             }
+            systemUiVisibility |= getExtraFullscreenUIFlags();
         } else {
             mWindow.addFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN);
             mWindow.clearFlags(WindowManager.LayoutParams.FLAG_FORCE_NOT_FULLSCREEN);
@@ -416,4 +418,18 @@ public class FullscreenHtmlApiHandler {
         mHandler.sendEmptyMessageDelayed(
                 MSG_ID_SET_FULLSCREEN_SYSTEM_UI_FLAGS, ANDROID_CONTROLS_SHOW_DURATION_MS);
     }
+
+    /*
+     * Helper method to return extra fullscreen UI flags for Kitkat devices.

[Ted C, 2015/03/30 22:58:30]

for KitKat [and above] devices.

+     * @return fullscreen flags to be applied to system UI visibility.
+     */
+    private int getExtraFullscreenUIFlags() {
+        int flags = 0;
+        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {
+            flags |= View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION;
+            flags |= View.SYSTEM_UI_FLAG_HIDE_NAVIGATION;
+            flags |= View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY;
+        }
+        return flags;
+    }
 }