implemented https://w3c.github.io/webdriver/#print currently supporte…

[babusekaran]

Implemented https://w3c.github.io/webdriver/#print as pdf(), streamlined pdf() API between DevToolsDriver and WebDriver.

pdf({})

currently supported in chrome > 85 with chromedriver > 85 and only in headless mode

sample input json to pdf() supported as per w3c spec

 {
      'orientation': 'landscape',
      'scale': 1.1,
      'margin': {
        'top': 1.1,
        'bottom': 2.2,
        'left': 3.3,
        'right': 4.4
       },
      'background': true,
      'shrinkToFit': false,
      'pageRanges': [1],
      'page': {
       'width': 15.6,
       'height': 20.6
     }
 }

ref:
https://chromedriver.storage.googleapis.com/85.0.4183.83/notes.txt
https://bugs.chromium.org/p/chromedriver/issues/detail?id=3481&q=3481&can=2
https://w3c.github.io/webdriver/#print

• Relevant Issues : (compulsory)
• Relevant PRs : (optional)
• Type of change :
  • New feature
  • Bug fix for existing feature
  • Code quality improvement
  • Addition or Improvement of tests
  • Addition or Improvement of documentation

[ptrthomas]

@babusekaran thank you ! can you suggest if a README change is needed as well

[babusekaran]

Sure @ptrthomas, can you please let me know if below-added documentation is sufficient

babusekaran@025bd69

[ptrthomas]

@babusekaran yes that is exactly what I was thinking