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In monochrome webview mode onResourceLoaded currently rewrites all
resource ids inside resource arrays including system resource IDs. This
is a bug.

The first try to fix the bug (cl/952097) caused a performance regression
in webview startup so this is a different idea to fixing the same bug
that should hopefully not suffer from the same performance regression as
the previous.

Since resource IDs are sorted (so system resources are at the beginning
of the array).  This CL finds the index of the first non-system resource
ID and starts rewriting at that point.

NOTRY=true #win7_chromium_rel_ng extremely flakey

Bug: 821425
Change-Id: I9f6f3c517a8c09cbbefb9b584ab6f5bfc9c8477b
Reviewed-on: https://chromium-review.googlesource.com/999003
Commit-Queue: Mohamed Heikal <mheikal@chromium.org>
Reviewed-by: agrieve <agrieve@chromium.org>
Cr-Commit-Position: refs/heads/master@{#549267}