[SPARK-6860][Streaming][WebUI] Fix the possible inconsistency of StreamingPage#5470

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zsxwing wants to merge 2 commits intoapache:masterfrom

zsxwing:SPARK-6860

Commits on Apr 11, 2015

Add synchronized to make sure we have a consistent view of StreamingJobProgressListener when creating the content
zsxwing
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Add missing 'synchronized' in StreamingJobProgressListener
zsxwing
committed