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

extensions/browser/guest_view/guest_view_base.cc

Index: extensions/browser/guest_view/guest_view_base.cc
diff --git a/extensions/browser/guest_view/guest_view_base.cc b/extensions/browser/guest_view/guest_view_base.cc
index 7e5568711db5d64b17226cc211db8ede3f94a465..5340ff5a02e5a97f51559a210fe918a2dee3a6c1 100644
--- a/extensions/browser/guest_view/guest_view_base.cc
+++ b/extensions/browser/guest_view/guest_view_base.cc
@@ -79,10 +79,34 @@ class GuestViewBase::OwnerLifetimeObserver : public WebContentsObserver {
                         content::WebContents* embedder_web_contents)
       : WebContentsObserver(embedder_web_contents),
         destroyed_(false),
-        guest_(guest) {}
+        guest_(guest),
+        fullscreen_(false) {}
 
   ~OwnerLifetimeObserver() override {}
 
+  void DidToggleFullscreenModeForTab(
+      bool entered_fullscreen) override {
+    fullscreen_ = entered_fullscreen;
+    printf("+++++ %s, entered_fullscreen: %d\n",
+        __PRETTY_FUNCTION__, entered_fullscreen);
+    guest_->EmbedderFullscreenToggled(fullscreen_);
+  }
+
+  void MainFrameWasResized(bool width_changed) override {
+    printf("EMB::MainFrameWasResized\n");
+    printf("Will call EMB::IsFullscreenForTabOrPending\n");
+    bool is_f =
+        web_contents()->GetDelegate()->IsFullscreenForTabOrPending(
+            web_contents());
+    printf("Called EMB::IsFullscreenForTabOrPending\n");
+    if (fullscreen_ && !is_f) {
+//        web_contents()->GetDelegate()->IsFullscreenForTabOrPending(
+//            web_contents())) {
+      fullscreen_ = false;
+      guest_->EmbedderFullscreenToggled(fullscreen_);
+    }
+  }
+
   // WebContentsObserver implementation.
   void WebContentsDestroyed() override {
     // If the embedder is destroyed then destroy the guest.
@@ -105,6 +129,7 @@ class GuestViewBase::OwnerLifetimeObserver : public WebContentsObserver {
  private:
   bool destroyed_;
   GuestViewBase* guest_;
+  bool fullscreen_;
 
   void Destroy() {
     if (destroyed_)