[PWA/Trusted Icons] Fix policy and default icon reading, histograms This CL adds some histograms to the trusted icons reading API in the WebAppIconManager to count the success and failure hits while reading icons from disk. Also based on recent discussions and the requirement to move away from fallback logic, the CL also updates how icon metadata and bitmaps are stored on disk for normal installs as well as policy/default installs, so that now they're in sync (as verified in the E2E tests). Bug: 423906188 Change-Id: Ibd9851cee001d35412cf43e20503c33886e68598 Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6956654 Reviewed-by: May Siem <msiem@chromium.org> Commit-Queue: Dibyajyoti Pal <dibyapal@chromium.org> Reviewed-by: Daniel Murphy <dmurph@chromium.org> Cr-Commit-Position: refs/heads/main@{#1517380}
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