Add text autosizing override in the inspector.

Source/devtools/front_end/OverridesSupport.js

Index: Source/devtools/front_end/OverridesSupport.js
diff --git a/Source/devtools/front_end/OverridesSupport.js b/Source/devtools/front_end/OverridesSupport.js
index c8567380d719116e06d68bed7768d4e1d6962817..08641d278b56a3283811c18e3aded18831cb435d 100644
--- a/Source/devtools/front_end/OverridesSupport.js
+++ b/Source/devtools/front_end/OverridesSupport.js
@@ -53,6 +53,9 @@ WebInspector.OverridesSupport = function()
 
     WebInspector.settings.overrideCSSMedia.addChangeListener(this._cssMediaChanged, this);
     WebInspector.settings.emulatedCSSMedia.addChangeListener(this._cssMediaChanged, this);
+
+    WebInspector.settings.overrideTextAutosizing.addChangeListener(this._textAutosizingChanged, this);
+    WebInspector.settings.enableTextAutosizing.addChangeListener(this._textAutosizingChanged, this);
 }
 
 /**
@@ -336,6 +339,7 @@ WebInspector.OverridesSupport.prototype = {
         this._geolocationPositionChanged();
         this._emulateTouchEventsChanged();
         this._cssMediaChanged();
+        this._textAutosizingChanged();
     },
 
     _userAgentChanged: function()
@@ -382,6 +386,15 @@ WebInspector.OverridesSupport.prototype = {
     {
         PageAgent.setEmulatedMedia(this._overridesActive && WebInspector.settings.overrideCSSMedia.get() ? WebInspector.settings.emulatedCSSMedia.get() : "");
         WebInspector.cssModel.mediaQueryResultChanged();
+    },
+
+    _textAutosizingChanged: function()
+    {
+        if (!this._overridesActive || !WebInspector.settings.overrideTextAutosizing.get()) {
+            PageAgent.clearTextAutosizingOverride();
+            return;
+        }
+        PageAgent.setTextAutosizingOverride(WebInspector.settings.enableTextAutosizing.get());
     }
 }