bug 832524 pt 1 - account for resolution-dependent size of menuitem icons in GetGutterSize. r=jimm
bug 818927 - convert drop location to logical pixels for Windows. r=jimm
bug 818927 part 2 - refactoring - create a GetDPIScale method in gfxWindowsPlatform, and use this to replace GetDeviceCaps(hdc, LOGPIXELSY) in widget code. r=jimm
bug 851952 - handle conversion between logical and device pixels in Windows screen-manager and window position-constraint code. r=jimm