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The PaymentHandler UI is opened as an ChromeCustomTab Activity. Going
forwards, we will refactor the Payment Handler to make it based on
bottom-sheet.

For this purpose, this CL adds:
* A blank bottom-sheet-based Payment Handler UI.
* "ScrollToExpandPaymentHandler" to enable the incomplete feature while
we are still developing the refactored solution.

Here's the expected change after the patch:

Flag:
When this flag is disabled (default), Payment Handler is unchanged.
When this flag is enabled (--enable-features=ScrollToExpandPaymentHandler),
the Payment Handler UI is changed to blank widget.

The Payment Handler bottom-sheet:
The Payment Handler UI will be displayed as an empty bottom-sheet. The
swipe-down can dismissing the UI; the swipe-up can maximize the UI.

Bug: 999196

Change-Id: Id839dfe63a9473243c5864295c5ae435ee725e55
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1832702
Commit-Queue: Liquan (Max) Gu <maxlg@chromium.org>
Reviewed-by: Rouslan Solomakhin <rouslan@chromium.org>
Reviewed-by: Matthew Jones <mdjones@chromium.org>
Reviewed-by: Andrew Grieve <agrieve@chromium.org>
Cr-Commit-Position: refs/heads/master@{#702998}