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Restructuring TasksSurface with AppBarLayout.
Adapting StartSurface and sub components to work with new layout.

Before: RecyclerView inside NestedScrollView did not recycle views.
Now: RecyclerView recycles views inside CoordinatorLayout.

Bug: 1000295

Change-Id: I73b01f1f4efcb7e263894b64e2b0f81a07229f23
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1865399
Commit-Queue: Mia Glaese <glamia@chromium.org>
Reviewed-by: Yusuf Ozuysal <yusufo@chromium.org>
Reviewed-by: Ganggui Tang <gogerald@chromium.org>
Cr-Commit-Position: refs/heads/master@{#707970}