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This CL adds SigninView to SigninFragmentBase and introduces the first
chunk of SigninView layout: SigninScrollView and a bottom button bar.
SigninScrollView implements observable ScrollView similarly to
AccountSigninConfirmationView, but without special onMeasure. Buttons
doesn't have android:text specified as SigninFragmentBase will set texts
for UI elements programmatically (similarly to
AccountSigninView.updateConsentText).
The rest of this layout will be added by subsequent CLs.

Bug: 814728
Change-Id: I3ac2c5fbdb41101a768abc70b3d1c3daa85fccb1
Reviewed-on: https://chromium-review.googlesource.com/962792Reviewed-by: Bernhard Bauer <bauerb@chromium.org>
Commit-Queue: Boris Sazonov <bsazonov@chromium.org>
Cr-Commit-Position: refs/heads/master@{#543426}