Start hooking up "element.requestFullscreen()" in chrome for android.

chrome/browser/component/web_contents_delegate_android/web_contents_delegate_android.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/component/web_contents_delegate_android/web_contents_delegate_android.h"
 
 #include <android/keycodes.h>
 
 #include "base/android/jni_android.h"
 #include "base/android/jni_string.h"
@@ skipping 262 matching lines @@
   if (obj.is_null())
     return;
   ScopedJavaLocalRef<jobject> content_view_core =
       content::ContentViewCore::FromWebContents(source)->GetJavaObject();
   if (content_view_core.is_null())
     return;
   Java_WebContentsDelegateAndroid_showRepostFormWarningDialog(env, obj.obj(),
       content_view_core.obj());
 }
 
+void WebContentsDelegateAndroid::ToggleFullscreenModeForTab(
+    WebContents* web_contents,
+    bool enter_fullscreen) {
+  JNIEnv* env = AttachCurrentThread();
+  ScopedJavaLocalRef<jobject> obj = GetJavaDelegate(env);
+  if (obj.is_null())
+    return;
+  Java_WebContentsDelegateAndroid_toggleFullscreenModeForTab(
+      env, obj.obj(), enter_fullscreen);
+}
+
+bool WebContentsDelegateAndroid::IsFullscreenForTabOrPending(
+    const WebContents* web_contents) const {
+  JNIEnv* env = AttachCurrentThread();
+  ScopedJavaLocalRef<jobject> obj = GetJavaDelegate(env);
+  if (obj.is_null())
+    return false;
+  return Java_WebContentsDelegateAndroid_isFullscreenForTabOrPending(
+      env, obj.obj());
+}
+
 // ----------------------------------------------------------------------------
 // Native JNI methods
 // ----------------------------------------------------------------------------
 
 // Register native methods
 
 bool RegisterWebContentsDelegateAndroid(JNIEnv* env) {
   if (!HasClass(env, kWebContentsDelegateAndroidClassPath)) {
     DLOG(ERROR) << "Unable to find class WebContentsDelegateAndroid!";
     return false;
   }
   return RegisterNativesImpl(env);
 }
 
 }  // namespace web_contents_delegate_android