[Webkit-unassigned] [Bug 88167] New: [chromium] The size of scrollbar arrow button is not correct for painting on Windows

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=88167

           Summary: [chromium] The size of scrollbar arrow button is not
                    correct for painting on Windows
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
        OS/Version: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebCore Misc.
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: hongbo.min at intel.com


The size of scrollbar arrow button returned by ScrollbarThemeChromiumWin::buttonSize is not correct on Windows.

For Linux, ScrollbarThemeChromiumLinux::buttonSize in WebCore is actually delegated to getSize on NativeTheme instance.

For Android, because the scrollbar arrow button is painted by threaded compositor, buttonSize returns hard-coded value (0, 0) directly.

Since the theme framework built upon NativeTheme class hierarchy, for AURA theme, we don't draw scrollbar button which requires that the button size should be a empty rectangle. However, there is no way for aura theme to get the correct button size in WebCore level.

Reference http://code.google.com/p/chromium/issues/detail?id=130856 for a bug in chromium caused by it.

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