Merge "Initialize mCurrentPageCanvas on construction" into sc-dev

    std::unique_ptr<SkSharingSerialContext> mSerialContext;

    std::unique_ptr<SkSharingSerialContext> mSerialContext;

    std::unique_ptr<SkNWayCanvas> mNwayCanvas;

    std::unique_ptr<SkNWayCanvas> mNwayCanvas;

    SkCanvas* mCurrentPageCanvas;

    SkCanvas* mCurrentPageCanvas = nullptr;

    // Capturing and interval control.

    // Capturing and interval control.

    bool mCaptureRunning = false;

    bool mCaptureRunning = false;