Increase the minimum interval for timers on background tabs to reduce their CPU consumption.
Increase the minimum interval for timers on background tabs to reduce
their CPU consumption.

The new interval is 1000 ms, or once per second. We can easily adjust
this value up or down, but this seems like a reasonable value to judge
the compatibility impact of this change.

BUG=66078
TEST=none (tested manually with minimal test case)

Review URL: http://codereview.chromium.org/6546021

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@75430 0039d316-1c4b-4281-b951-d872f2087c98

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