Add flag for enabling/disabling video fullscreen detection

chrome/android/java/src/org/chromium/chrome/browser/AppHooks.java

Index: chrome/android/java/src/org/chromium/chrome/browser/AppHooks.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/AppHooks.java b/chrome/android/java/src/org/chromium/chrome/browser/AppHooks.java
index a297c976fdd3212083bbc55b0174b90a334e9b36..b8f71672f6764accd22cd71e8ff3bb86bdb15435 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/AppHooks.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/AppHooks.java
@@ -11,6 +11,7 @@ import android.os.Handler;
 import android.os.Looper;
 
 import org.chromium.base.ContextUtils;
+import org.chromium.base.annotations.CalledByNative;
 import org.chromium.chrome.browser.banners.AppDetailsDelegate;
 import org.chromium.chrome.browser.customtabs.CustomTabsConnection;
 import org.chromium.chrome.browser.datausage.ExternalDataUseObserver;
@@ -55,6 +56,7 @@ import org.chromium.policy.CombinedPolicyProvider;
 public abstract class AppHooks {
     private static AppHooksImpl sInstance;
 
+    @CalledByNative
     public static AppHooks get() {
         if (sInstance == null) {
             sInstance = new AppHooksImpl();
@@ -304,4 +306,14 @@ public abstract class AppHooks {
         // {@link android.app.Service#startForeground(int, Notification)}.
         ContextUtils.getApplicationContext().startService(intent);
     }
-}
+
+    /**
+     * @return Whether the renderer should detect whether video elements are in fullscreen. The
+     * detection results can be retrieved through
+     * {@link WebContents.hasActiveEffectivelyFullscreenVideo()}.
+     */
+    @CalledByNative
+    public boolean shouldDetectVideoFullscreen() {
+        return false;
+    }
+}