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This adds a targetSdk quirk for WebView's CookieManager API. Starting
for apps which target Android R, WebView will no longer accept cookies
for insecure ('http' scheme) URLs which also specify the 'Secure' cookie
directive.

While this changed for Chrome in M58
(https://www.chromestatus.com/feature/4506322921848832), WebView has
been working around this by fixing up the URL's scheme to 'https'.
WebView will continue to do so for apps targeting < R.

This adds a histogram to track the new case.

Bug: 933981
Test: run_webview_instrumentation_test_apk -f CookieManagerTest#testSetSecureCookieForHttpUrl*
Change-Id: Ie31f02911d38984983fdf4afeb4d6e1eb4f7d094
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2040685Reviewed-by: Richard Coles <torne@chromium.org>
Commit-Queue: Nate Fischer <ntfschr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#739044}