DevTools: explicitly control support for viewport meta tag so that desktop emulation was possible

Source/devtools/protocol.json

Index: Source/devtools/protocol.json
diff --git a/Source/devtools/protocol.json b/Source/devtools/protocol.json
index 97cc2365ffa30945eed170c4c652fedcc2021e56..26ed16cd9aa354a870e151f1bcc350a3c0d1cc7d 100644
--- a/Source/devtools/protocol.json
+++ b/Source/devtools/protocol.json
@@ -316,6 +316,7 @@
                     { "name": "width", "type": "integer", "description": "Overriding width value in pixels (minimum 0, maximum 10000000). 0 disables the override." },
                     { "name": "height", "type": "integer", "description": "Overriding height value in pixels (minimum 0, maximum 10000000). 0 disables the override." },
                     { "name": "deviceScaleFactor", "type": "number", "description": "Overriding device scale factor value (must be positive)." },
+                    { "name": "emulateViewport", "type": "boolean", "description": "Whether viewport meta tag should be respected." },
                     { "name": "fitWindow", "type": "boolean", "description": "Whether a view that exceeds the available browser window area should be scaled down to fit." },
                     { "name": "textAutosizing", "type": "boolean", "optional": true, "description": "Whether to override the text autosizing feature." },
                     { "name": "fontScaleFactor", "type": "number", "optional": true, "description": "Overriding system font scale factor (must be positive)." }