Add URL permission to image loader to use analytics.
Add URL permission to image loader to use analytics.

BUG=516250
TEST=None
TBR=fukino@chromium.org

Review URL: https://codereview.chromium.org/1297163002

Cr-Commit-Position: refs/heads/master@{#343849}
(cherry picked from commit f8b4519cadf7dea1e6c6c5337afc5da5e73e5548)

Review URL: https://codereview.chromium.org/1299383003 .

Cr-Commit-Position: 62bea078bfe806fd4d8dc2d3869914b6c8093498@{#378}
Cr-Branched-From: ef8f355264e75087b06072b03d328c50bf72843a@{#338390}

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