Background: testSearchHistory needs to type something into the search text field, however due to crbug.com/753098, grey_typeText doesn't work on iPad. Wanted to use grey_replaceText, however, it doesn't work either because grey_replaceText sends out UIControlEventEditingChanged, but the history search view controller doesn't respond to UIControlEventEditingChanged.

We shouldn't make it respond to UIControlEventEditingChanged just for the test, but we need to understand why it doesn't given that all other UI parts like find in page and omnibox do.