Implement SyncEngine::NotifyLastOperationStatus

BUG=23026006

Review URL: https://codereview.chromium.org/84693004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@237054 0039d316-1c4b-4281-b951-d872f2087c98
Disable PPAPI tests that time out on ChromiumOS

BUG=323144
TBR=yzshen@chromium.org

Review URL: https://codereview.chromium.org/85583002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@237055 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 237055
Return NOT_A_DIRECTORY error if there's a file in a path chain in CreateDirectory(recursive)

BUG=none
TEST=ObfuscatedFileUtilTest.CreateDirectory_NotADirectoryInRecursive

Review URL: https://codereview.chromium.org/85233002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@237056 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 237056