Fix DpiAware.GetSystemDpi and expose DpiAware.Scale

[cztomczak]

DpiAware.GetSystemDpi error

Error:

File "dpi_aware_win.pyx", line 26, in cefpython_py27.DpiAware.GetSystemDpi
TypeError: tuple() takes at most 1 argument (2 given)

Source code:

return tuple(dpix, dpiy)

This should replaced with:

return (dpix, dpiy)

Temporarily you could use pywin32/ctypes extensions to get system dpi settings, this would require translating this C++ code to a Python equivalent:

cefpython/src/client_handler/dpi_aware.cpp

Line 129 in 824d7ce

void GetSystemDpi(int* dpix, int* dpiy) {

Issue #399 is blocked by this issue.

Expose DpiAware.Scale

Additionally, it should be fixed how CalculateWindowSize behaves. Currently it only allows for sizes that are factor of 0.25 when scaling (1.0, 1.25, 1.5, etc). In Windows 10 you can set custom scaling to for example "132%" and it should scale window size exactly by 132%.

[cztomczak]

Done in rev e6bcf2c.