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This patch refactors the relationship between PaymentRequestDialogView
and PaymentRequestState to be more generic. Instead of waiting for the
state event of fetching all payment instruments (specific), the view now
waits for an initialization task (abstraction) to finish initialization
(generic). This will help to add more initialization tasks in follow up
patches. For example, PaymentRequestSpec will become an initialization
task as well, so the view can wait for the spec to completely
initialized, in case if PaymentRequest.show() was called with a promise.

Bug: 817073
Change-Id: I19c133ab3084a7a26628380135c21abeeb1c7436
Reviewed-on: https://chromium-review.googlesource.com/c/1478090
Commit-Queue: Rouslan Solomakhin <rouslan@chromium.org>
Reviewed-by: Danyao Wang <danyao@chromium.org>
Cr-Commit-Position: refs/heads/master@{#634710}