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We need these write stream interface for implementing generic cross-filesystem operation and to eventually deprecate OpenFileSystem::Write and PlatformFile related interface.

BUG=123993
TEST=unit_tests --gtest_filter='*LocalFileWriter*'

Review URL: http://codereview.chromium.org/10126004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@133892 0039d316-1c4b-4281-b951-d872f2087c98