Add text autosizing override in the inspector.

Source/devtools/protocol.json

Index: Source/devtools/protocol.json
diff --git a/Source/devtools/protocol.json b/Source/devtools/protocol.json
index 14ceb5e96b2ea092d01e3839489305dac4d0602e..37f04f783daf04e14a0e60b29557174c50fe20a2 100644
--- a/Source/devtools/protocol.json
+++ b/Source/devtools/protocol.json
@@ -335,12 +335,13 @@
             },
             {
                 "name": "setDeviceMetricsOverride",
-                "description": "Overrides the values of device screen dimensions (window.screen.width, window.screen.height, window.innerWidth, window.innerHeight, and \"device-width\"/\"device-height\"-related CSS media query results) and the font scale factor.",
+                "description": "Overrides the values of device screen dimensions (window.screen.width, window.screen.height, window.innerWidth, window.innerHeight, \"device-width\"/\"device-height\"-related CSS media query results), the font scale factor, and text autosizing.",
                 "parameters": [
                     { "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": "fitWindow", "type": "boolean", "description": "Whether a view that exceeds the available browser window area should be scaled down to fit." }
+                    { "name": "fitWindow", "type": "boolean", "description": "Whether a view that exceeds the available browser window area should be scaled down to fit." },
+                    { "name": "textAutosizing", "type": "integer", "description": "Text autosizing override (0 to not override, 1 to force enabled, 2 to force disabled)." }
                 ],
                 "hidden": true
             },