pinch zoom shortcuts for mobile emulators

I used three emulators for mobile development:

1. Chrome Canary: Android is better
2. Genymotion: Mac only / Android
3. iOS Simulator: Mac only / iPhone 

But the shortcut of pinch zoom are different.

Chrome Canary: Shift + drag up/down

• Mac: shift + three fingers swipe up/down
• Windows: shift + drag

Genymotion: 

• ⌘ + drag left/right
• ⌘ + three fingers swipe left/right

iOS Simulator: ⌥ (option) + drag

• Mac: ⌥ + three fingers swipe