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bokan authored
It turns out Aura (and Android) overlay scrollbars weren't using the minimum defined in NativeThemeAura. Instead, the minimum was set from ScrollbarTheme::minimumThumbLength which just returns the thumb thickness. After adding an override for ScrollbarThemeOverlay which correctly uses the value form NativeThemeAura, the only consumers of ScrollbarTheme::minimumThumbLength are the mock classes so I moved the base implementation into the Mock class and made the base pure virtual. BUG=678595 Review-Url: https://codereview.chromium.org/2734483002 Cr-Original-Commit-Position: refs/heads/master@{#460199} Committed: https://chromium.googlesource.com/chromium/src/+/151a2db45f5fdbca8973988dd51d2bf6c86fbc8c Review-Url: https://codereview.chromium.org/2734483002 Cr-Commit-Position: refs/heads/master@{#460367}
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