tree dbc3afbe1ab4be8a129543d42c081c959ac51059
parent 4bf526852a9990d2e5c3158636d7c9dcf679a5e5
author Daichi Hirono <hirono@google.com> 1434513263 +0900
committer Daichi Hirono <hirono@google.com> 1434513263 +0900

Fix DocumentsTest#testTree.

Previously the test sometimes crashed because it tries to read data before the
provider completes writing.

The CL adds synchronized blocks to the provider's implementation so that it
blocks read operation before writing.

BUG=21330123

Change-Id: I3b5ba5d2fb8e1f998179c587ff8733a0a8a2302b