[Android Webapp] Catch IllegalStateException thrown by requestPinShorctcut()

According to the docs
(https://developer.android.com/reference/android/content/pm/ShortcutManager.html)
ShortcutManager#requestPinShortcut() throws an IllegalStateException if
"The caller doesn't have a foreground activity or a foreground service, or the
device is locked."

We create a home screen shortcut if WebAPK install fails. WebAPK installs time
out and fail out after 3 minutes. A user may be using a different app by the
time that the time out occurs.

This CL catches and ignores IllegalStateExceptions thrown by
ShortcutHelper#requestPinShortcut()

Bug=819725

Cq-Include-Trybots: master.tryserver.chromium.mac:ios-simulator-cronet;master.tryserver.chromium.mac:ios-simulator-full-configs
Change-Id: Iceab1a25a0d80b9869cfc523f091c3af8e590a76
Reviewed-on: https://chromium-review.googlesource.com/959751
Commit-Queue: Peter Kotwicz <pkotwicz@chromium.org>
Reviewed-by: Dominick Ng <dominickn@chromium.org>
Cr-Commit-Position: refs/heads/master@{#542813}

chrome/android/java/src/org/chromium/chrome/browser/ShortcutHelper.java

@@ -231,7 +231,13 @@ public class ShortcutHelper {
                                             .setIcon(Icon.createWithBitmap(icon))
                                             .setIntent(shortcutIntent)
                                             .build();
-        sShortcutManager.requestPinShortcut(shortcutInfo, null);
+        try {
+            sShortcutManager.requestPinShortcut(shortcutInfo, null);
+        } catch (IllegalStateException e) {
+            Log.d(TAG,
+                    "Could not create pinned shortcut: device is locked, or "
+                            + "activity is backgrounded.");
+        }
     }
 
     /**