[Chromecast] Call CreateWindowForWebContents only once

If the method is called a second time, instead make a window priority
request.

Bug: internal 160358649
Test: on device
Change-Id: I6b38cafb3198a607136e54542f65c6f4df8b163b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2293419
Reviewed-by: Luke Halliwell (slow) <halliwell@chromium.org>
Commit-Queue: Cicy Tan <shiyun@google.com>
Cr-Commit-Position: refs/heads/master@{#787432}

chromecast/browser/android/cast_content_window_android.cc

@@ -77,6 +77,7 @@ CastContentWindowAndroid::CastContentWindowAndroid(
     const CastContentWindow::CreateParams& params)
     : CastContentWindow(params),
       activity_id_(delegate_->GetId()),
+      web_contents_attached_(false),
       java_window_(CreateJavaWindow(reinterpret_cast<jlong>(this),
                                     params.is_headless,
                                     params.enable_touch_input,
@@ -94,13 +95,18 @@ void CastContentWindowAndroid::CreateWindowForWebContents(
     mojom::ZOrder /* z_order */,
     VisibilityPriority visibility_priority) {
   DCHECK(cast_web_contents);
+  if (web_contents_attached_) {
+    RequestVisibility(visibility_priority);
+    return;
+  }
   JNIEnv* env = base::android::AttachCurrentThread();
   base::android::ScopedJavaLocalRef<jobject> java_web_contents =
       cast_web_contents->web_contents()->GetJavaWebContents();
 
   Java_CastContentWindowAndroid_createWindowForWebContents(
       env, java_window_, java_web_contents,
       static_cast<int>(visibility_priority));
+  web_contents_attached_ = true;
 }
 
 void CastContentWindowAndroid::GrantScreenAccess() {

chromecast/browser/android/cast_content_window_android.h

@@ -56,6 +56,7 @@ class CastContentWindowAndroid : public CastContentWindow {
 
  private:
   const std::string activity_id_;
+  bool web_contents_attached_;
   base::android::ScopedJavaGlobalRef<jobject> java_window_;
 
   DISALLOW_COPY_AND_ASSIGN(CastContentWindowAndroid);