DevTools: add emulation toggle button and splash screen.

Source/devtools/front_end/sdk/OverridesSupport.js

Index: Source/devtools/front_end/sdk/OverridesSupport.js
diff --git a/Source/devtools/front_end/sdk/OverridesSupport.js b/Source/devtools/front_end/sdk/OverridesSupport.js
index 26d56cabf001c3b0811e1bac8910ae5e1c0687e4..af745677827a6a7728709a4aadab1fedb47c7cf4 100644
--- a/Source/devtools/front_end/sdk/OverridesSupport.js
+++ b/Source/devtools/front_end/sdk/OverridesSupport.js
@@ -265,7 +265,7 @@ WebInspector.OverridesSupport.deviceSizeValidator = function(value)
  */
 WebInspector.OverridesSupport.deviceScaleFactorValidator = function(value)
 {
-    if (!value || (/^[\d]+(\.\d+)?|\.\d+$/.test(value) && value >= 0 && value <= 10000))
+    if (!value || (/^[\d]+(\.\d+)?|\.\d+$/.test(value) && value >= 0 && value <= 10))
         return "";
     return WebInspector.UIString("Value must be non-negative float");
 }
@@ -994,7 +994,7 @@ WebInspector.OverridesSupport.prototype = {
         var devices = WebInspector.OverridesSupport._phones.concat(WebInspector.OverridesSupport._tablets).concat(WebInspector.OverridesSupport._desktops);
         devices.sort();
 
-        var selectDevice = [WebInspector.UIString("<Select device>"), "", ""];
+        var selectDevice = [WebInspector.UIString("<Select model>"), "", ""];
         devices = devices.concat([selectDevice]);
         for (var i = 0; i < devices.length; ++i) {
             var device = devices[i];
@@ -1088,6 +1088,11 @@ WebInspector.OverridesSupport.prototype = {
         return throughputSelectElement;
     },
 
+    reveal: function()
+    {
+        WebInspector.Revealer.reveal(this);
+    },
+
     __proto__: WebInspector.Object.prototype
 }