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Originally chrome://crashes only displayed uploaded crashes, and only
displayed the time at which the crash report was uploaded.

On systems using Crashpad we also have access to the crash capture-time
which is useful in identifying crash reports which occurred while
offline, for example, such that the capture and upload times would
differ considerably.

This patch was originally drafted by phistuck@gmail.com and
jiameng@chromium.org.

BUG=664430,674249

Review-Url: https://codereview.chromium.org/2612993003
Cr-Commit-Position: refs/heads/master@{#442091}