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Adam Comella e1b3bbdb04 Android: Refactor HierarchyOptimizer in preparation of inline view support

Summary:
This PR was split from commits originally in #8619. /cc dmmiller

These refactorings to the HierarchyOptimizer are in preparation for implementing support for inline views in #8619.

**Refactoring 1: Collapse add*LayoutOnlyNodeToLayoutOnlyNode**

addLayoutOnlyNodeToLayoutOnlyNode and addNonLayoutOnlyNodeToLayoutOnlyNode
had nearly identical implementations. They both walk thru the ancestors
looking for a nonlayout-only node and adjusting the passed in index at each
step. This introduces a new function, walkUpUntilNonLayoutOnly, which
takes care of that responsibility. This simplifies addNodeToNode
because it can now consider the type of the parent and the type of
the child independently.

**Refactoring 2: Extract addGrandchildren**

Pull out addLayoutOnlyNode's logic into a helper called
addGrandchildren. We will need to call this method in
another place later.

**Test plan (required)**

This change was tested with UIExplorer and a small test app and it's being used in my team's app.
Closes https://github.com/facebook/react-native/pull/8908

Differential Revision: D3592783

Pulled By: dmmiller

fbshipit-source-id: a513e8d381e71112ce6348bbee7d4a7c62c33619

2016-07-20 04:28:36 -07:00