Fix NPE when starting CastWebContentsFragment

Bug: b/76458625
Change-Id: I157d04a4b60fb7e206ee6f90d7f344801a7708af
Reviewed-on: https://chromium-review.googlesource.com/982009Reviewed-by: Luke Halliwell <halliwell@chromium.org>
Commit-Queue: Zhiheng(Vincent) Li <vincentli@google.com>
Cr-Commit-Position: refs/heads/master@{#546173}

chromecast/browser/android/apk/src/org/chromium/chromecast/shell/CastWebContentsFragment.java

@@ -82,12 +82,13 @@ public class CastWebContentsFragment extends Fragment {
         Log.d(TAG, "onStart");
         super.onStart();
 
-        sendIntentSync(CastWebContentsIntentUtils.onVisibilityChange(mSurfaceHelper.getInstanceId(),
-                CastWebContentsIntentUtils.VISIBITY_TYPE_FULL_SCREEN));
-
         if (mSurfaceHelper != null) {
+            sendIntentSync(
+                    CastWebContentsIntentUtils.onVisibilityChange(mSurfaceHelper.getInstanceId(),
+                            CastWebContentsIntentUtils.VISIBITY_TYPE_FULL_SCREEN));
             return;
         }
+
         mSurfaceHelper = new CastWebContentsSurfaceHelper(getActivity(), /* hostActivity */
                     (FrameLayout) getView().findViewById(R.id.web_contents_container),
                     true /* showInFragment */);
@@ -105,6 +106,8 @@ public class CastWebContentsFragment extends Fragment {
         boolean touchInputEnabled = CastWebContentsIntentUtils.isTouchable(bundle);
 
         mSurfaceHelper.onNewWebContents(uri, webContents, touchInputEnabled);
+        sendIntentSync(CastWebContentsIntentUtils.onVisibilityChange(mSurfaceHelper.getInstanceId(),
+                CastWebContentsIntentUtils.VISIBITY_TYPE_FULL_SCREEN));
     }
 
     @Override