Compute the popup location/size correctly when use-zoom-for-dsf is enabled.

third_party/WebKit/Source/web/resources/listPicker.js

Index: third_party/WebKit/Source/web/resources/listPicker.js
diff --git a/third_party/WebKit/Source/web/resources/listPicker.js b/third_party/WebKit/Source/web/resources/listPicker.js
index 167ad3cd77cc1ceb90b253edb6253f6541488ac0..2ac316dce7135210f1abdc8b176538ade3a583a1 100644
--- a/third_party/WebKit/Source/web/resources/listPicker.js
+++ b/third_party/WebKit/Source/web/resources/listPicker.js
@@ -193,31 +193,37 @@ ListPicker.prototype._handleKeyDown = function(event) {
 
 ListPicker.prototype._fixWindowSize = function() {
     this._selectElement.style.height = "";
-    var maxHeight = this._selectElement.offsetHeight;
+    var scale = global.params.scaleFactor;
+    var maxHeight = this._selectElement.offsetHeight / scale;
+
     // heightOutsideOfContent should be matched to border widths of the listbox
     // SELECT. See listPicker.css and html.css.
     var heightOutsideOfContent = 2;
-    var noScrollHeight = Math.round(this._calculateScrollHeight() + heightOutsideOfContent);
+    var noScrollHeight = Math.round(this._calculateScrollHeight() + heightOutsideOfContent) / scale;
     var desiredWindowHeight = noScrollHeight;
-    var desiredWindowWidth = this._selectElement.offsetWidth;
+    var offsetWidth = this._selectElement.offsetWidth / scale;
+    var desiredWindowWidth = offsetWidth;
+
     var expectingScrollbar = false;
     if (desiredWindowHeight > maxHeight) {
         desiredWindowHeight = maxHeight;
         // Setting overflow to auto does not increase width for the scrollbar
         // so we need to do it manually.
-        desiredWindowWidth += getScrollbarWidth();
+        desiredWindowWidth += getScrollbarWidth() / scale;
         expectingScrollbar = true;
     }
     desiredWindowWidth = Math.max(this._config.anchorRectInScreen.width, desiredWindowWidth);
-    var windowRect = adjustWindowRect(desiredWindowWidth, desiredWindowHeight, this._selectElement.offsetWidth, 0);
+    var windowRect = adjustWindowRect(desiredWindowWidth, desiredWindowHeight, offsetWidth, 0);
+
     // If the available screen space is smaller than maxHeight, we will get an unexpected scrollbar.
     if (!expectingScrollbar && windowRect.height < noScrollHeight) {
-        desiredWindowWidth = windowRect.width + getScrollbarWidth();
+        desiredWindowWidth = windowRect.width + getScrollbarWidth() / scale;
         windowRect = adjustWindowRect(desiredWindowWidth, windowRect.height, windowRect.width, windowRect.height);
     }
-    this._selectElement.style.width = windowRect.width + "px";
-    this._selectElement.style.height = windowRect.height + "px";
-    this._element.style.height = windowRect.height + "px";
+
+    this._selectElement.style.width = Math.round(windowRect.width * scale) + "px";
+    this._selectElement.style.height = Math.round(windowRect.height * scale) + "px";
+    this._element.style.height = Math.round(windowRect.height * scale) + "px";
     setWindowRect(windowRect);
 };