Restart fullscreen video playback when switching back from background

content/browser/android/content_view_core_impl.cc

Index: content/browser/android/content_view_core_impl.cc
diff --git a/content/browser/android/content_view_core_impl.cc b/content/browser/android/content_view_core_impl.cc
index 474e99536851d6b9c8e2de9aa1644b96243cda30..ebb225c85f129fe4d508b0093a0e86c120e13d74 100644
--- a/content/browser/android/content_view_core_impl.cc
+++ b/content/browser/android/content_view_core_impl.cc
@@ -330,6 +330,7 @@ void ContentViewCoreImpl::OnShow(JNIEnv* env, jobject obj) {
 
 void ContentViewCoreImpl::Show() {
   GetWebContents()->WasShown();
+  ResumeFullscreenVideo();
 }
 
 void ContentViewCoreImpl::Hide() {
@@ -343,6 +344,12 @@ void ContentViewCoreImpl::PauseVideo() {
     host->Send(new ViewMsg_PauseVideo(host->GetRoutingID()));
 }
 
+void ContentViewCoreImpl::ResumeFullscreenVideo() {
+  RenderViewHost* host = web_contents_->GetRenderViewHost();
+  if (host)
+    host->Send(new ViewMsg_ResumeFullscreenVideo(host->GetRoutingID()));
+}
+
 void ContentViewCoreImpl::OnTabCrashed() {
   JNIEnv* env = AttachCurrentThread();
   ScopedJavaLocalRef<jobject> obj = java_ref_.get(env);