<webview>: Implement fullscreen permission for html5 element.requestFullscreen()

extensions/renderer/guest_view/guest_view_internal_custom_bindings.h

 // Copyright 2014 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.
 
 #ifndef EXTENSIONS_RENDERER_GUEST_VIEW_GUEST_VIEW_INTERNAL_CUSTOM_BINDINGS_H_
 #define EXTENSIONS_RENDERER_GUEST_VIEW_GUEST_VIEW_INTERNAL_CUSTOM_BINDINGS_H_
 
 #include "extensions/renderer/object_backed_native_handler.h"
 
 namespace extensions {
@@ skipping 37 matching lines @@
   // called when the guestview's container is destroyed.
   // RegisterDestructionCallback takes in a single paramater, |callback|.
   void RegisterDestructionCallback(
       const v8::FunctionCallbackInfo<v8::Value>& args);
 
   // RegisterElementResizeCallback registers a JavaScript callback function to
   // be called when the element is resized. RegisterElementResizeCallback takes
   // a single parameter, |callback|.
   void RegisterElementResizeCallback(
       const v8::FunctionCallbackInfo<v8::Value>& args);
+
+  // Runs a JavaScript function with user gesture.
+  //
+  // This is used to request webview element to enter fullscreen (from the
+  // embedder).
+  // Note that the guest requesting fullscreen means it has already been
+  // triggered by a user gesture and we get to this point if embedder allows
+  // the fullscreen request to proceed.
+  void RunWithGesture(
+      const v8::FunctionCallbackInfo<v8::Value>& args);
 };
 
 }  // namespace extensions
 
 #endif  // EXTENSIONS_RENDERER_GUEST_VIEW_GUEST_VIEW_INTERNAL_CUSTOM_BINDINGS_H_