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When throttling, either when paused or when in background, only throttle
fallback tick. There are apps relying on the fact that invalidates are
not throttled when paused. When in background, framework should take
care of not calling back with draw for invalidates.

Internal bug b/11230312

BUG=
NOTRY=true

Review URL: https://codereview.chromium.org/58483002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@232909 0039d316-1c4b-4281-b951-d872f2087c98